2007 ISUZU KB P190 ignition

Engine Management – V6 – General Information Page 6C1-1–36

Intermittent
An electrical signal that occurs now and then; not continuously. In electrical circuits, refers to occasional open,
short, or ground in a circuit
Light Throttle Approximately 1/4 of accelerator pedal travel (25% throttle position)
Low
A voltage less than a specific threshold. Operates the same as a ground and may, or may not, be connected
to chassis ground.
MAF Sensor Mass Air Flow Sensor. A device that provides a variable voltage to the ECM based on the amount of air flow
entering in the intake system.
Medium Throttle Approximately 1/2 of accelerator pedal travel (50% throttle position)
N.C Normally Closed. Switch contacts that are closed when they are in the normal operating position
N.O Normally Open. Switch contacts that are normally open when in the normal operating position
NOx
Nitrogen Oxide. One of the pollutants found in spark ignition engine exhaust that is formed from normal
combustion and increases in severity with combustion temperature.
O2 Sensor Oxygen Sensor. A device located in the exhaust system that provides a variable voltage to the ECM based on
the oxygen content of exhaust gas.
May also include a heating circuit to provide faster initial warm-up (HO2 sensor).
OBD On Board Diagnostic
Open Loop ECM control of the fuel control system without the use of the oxygen sensor signal.
Output Functions that are controlled by the ECM, typically these can include solenoids and relays, etc.
ECM Engine Control Module. An electronic device which controls the engine management system.
ECU Electronic Control Unit. An electronic device which controls specific system functions
PCV
Positive Crankcase Ventilation. Method of reburning crankcase fumes rather than passing them directly into
the atmosphere
PIM Powertrain Interface Module – The PIM acts as a communication translator between the ECM and other on-
board controllers that use a different serial data protocol.
PM Permanent Magnet
PWM
Pulse Width Modulated. A digital signal turned on and off for a percentage of available cycle time. A signal that
is 30% on and 70% of would be termed a 30% on PWM signal.
Quad Driver A transistor in the ECM capable of operating four separate outputs. Outputs can be either on-off or pulse width
modulated.
RAM Random Access Memory. A microprocessor can write into or read from this memory as needed. This memory
is volatile and needs a constant power supply to be retained. If the power is lost or removed, RAM data is lost.
r.p.m. Revolutions Per Minute
Serial Data
Serial data is a series of rapidly changing voltage signals pulsed from high to low. These signals are typically
transmitted through a wire often referred to as the Serial Data Circuit.
SFI Sequential Fuel Injection. Method of injecting fuel into the engine one cylinder at a time in relation to the
engines firing order.
Solenoid An electromagnetic coil which creates a magnetic field when current is applied, causing a plunger or ball to
move.
Switch Device to opens and close a circuit, thereby controlling current flow.
Tech 2
Tech 2 is a peripheral device that aids in the diagnosis and repair of electronic systems such as engine
management, transmission control etc. Tech 2 connects to the vehicle’s Data Link Connector (DLC).
TP Sensor Throttle Position sensor. A device that provides a variable voltage to the ECM based on the position of the
throttle plate.
Vacuum – manifold Vacuum sourced downstream of the throttle plate.
Vacuum – ported Vacuum sourced upstream of the throttle plate.
VSS Vehicle Speed Sensor. A permanent magnet type device that provides a digital voltage to the ECM.
WOT Wide Open Throttle – Full travel of the accelerator pedal (100% throttle position).


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–2

6.8 Electronic Ignition (EI) System Diagnosis ......................................................................................................... 47
7 Diagnostic Trouble Code Tables ........................................................................................................50
7.1 DTC List ................................................................................................................................................................ 50
7.2 DTC P0008, P0009 or P0016 ...................................................................................................... .......................... 60
7.3 DTC P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056, P0057 or P0058 ................ 62
7.4 DTC P0040 or P0041 ............................................................................................................................................ 65
7.5 DTC P0053 or P0059 ............................................................................................................................................ 67
7.6 DTC P0101, P0102 or P0103 ...................................................................................................... .......................... 68
7.7 DTC P0112 or P0113 ............................................................................................................................................ 72
7.8 DTC P0116, P0117, P0118, P0125 or P1258 ........................................................................................ ............... 75
7.9 DTC P0121, P0122, P0123, P0221, P0222,or P0223................................................................................. .......... 78
7.10 DTC P0130, P0131, P0132, P0135, P0137, P0138, P0140, P0141, P0150 P0151, P0152, P0155, P0157, P0158,
P0160, P0161, P2243, P2247, P2270, P2271, P2272, P2273, P2297 or P2298 ................................................. 81

7.11 DTC P0133 or P0153 ............................................................................................................. ............................... 87
7.12 DTC P0139 or P0159 ............................................................................................................................................ 91
7.13 DTC P0196, P0197 or P0198 ...................................................................................................... .......................... 95
7.14 DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271,
P0273, P0274, P0276 or P0277................................................................................................... ......................... 97

7.15 DTC P0219 .......................................................................................................................................................... 100
7.16 DTC P0300 .......................................................................................................................................................... 101
7.17 DTC P0301, P0302, P0303, P0304, P0305 or P0306................................................................................. ........ 104
7.18 DTC P0324 .......................................................................................................................................................... 107
7.19 DTC P0327, P0328, P0332 or P0333 ............................................................................................... .................. 110
7.20 DTC P0335, P0336, P0337 or P0338 ................................................................................................................. 112
7.21 DTC P0341, P0342 or P0343 .............................................................................................................................. 115
7.22 DTC P0351, P0352, P0353, P0354, P0355, P0356, P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310,
P2312, P2313, P2315 or P2316................................................................................................... ....................... 118

7.23 DTC P0420 or P0430 .......................................................................................................................................... 121
7.24 DTC P0443, P0458 or P0459 ...................................................................................................... ........................ 123
7.25 DTC P0460, P0461, P0462 or P0463 ............................................................................................... .................. 125
7.26 DTC P0480, P0691 or P0692 .............................................................................................................................. 128
7.27 DTC P0500 .......................................................................................................................................................... 130
7.28 DTC P0504 or P0571 ............................................................................................................. ............................. 133
7.29 DTC P0506, P0507, P0638, P1551, P2100, P2101, P2119 or P2176 ................................................................ 135
7.30 DTC P0513, P0633, P1629, P1632, P1677, P1678 or P1679 .......................................................................... .. 139
7.31 DTC P0521, P0522 or P0523 .............................................................................................................................. 142
7.32 DTC P0532 or P0533 .......................................................................................................................................... 144
7.33 DTC P0560, P0562 or P0563 ...................................................................................................... ........................ 147
7.34 DTC P0601, P0602, P0604 or P0606 ............................................................................................... .................. 149
7.35 DTC P0615, P0616 or P0617 .............................................................................................................................. 151
7.36 DTC P0625 or P0626 .......................................................................................................................................... 153
7.37 DTC P0627, P0628 or P0629 ...................................................................................................... ........................ 154
7.38 DTC P0645, P0646 or P0647 .............................................................................................................................. 156
7.39 DTC P0685, P0686 or P0687 .............................................................................................................................. 158
7.40 DTC P0700 .......................................................................................................................................................... 160
7.41 DTC P0704 .......................................................................................................................................................... 161
7.42 DTC P0850 .......................................................................................................................................................... 163
7.43 DTC P1648 .......................................................................................................................................................... 165
7.44 DTC P1668, P2500 or P2501 ...................................................................................................... ........................ 166
7.45 DTC P1845 .......................................................................................................................................................... 168
7.46 DTC P2096 or P2098 ............................................................................................................. ............................. 170
7.47 DTC P2097 or P2099 .......................................................................................................................................... 174
7.48 DTC P2105 .......................................................................................................................................................... 178
7.49 DTC P2107 .......................................................................................................................................................... 180
7.50 DTC P2122, P2123, P2127, P2128 or P2138 ........................................................................................ ............. 181
7.51 DTC P2177 or P2179 .......................................................................................................................................... 184

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–4

1 General Information
1.1 Diagnostic System Check
The engine management diagnostic procedure is organised in a logical structure that begins with the Diagnostic System
Check. The Diagnostic System Check directs the diagnostic procedure to the logical steps necessary to diagnose an
engine driveability fault condition.
1.2 Diagnostic Trouble Code Tables
The Diagnostic System Check directs the diagnostic procedure to the appropriate diagnostic trouble code (DTC) tables
if there is a DTC currently stored in the engine control module (ECM).
The diagnostic tables locate a faulty circuit or component through a logic based on the process of elimination. These
diagnostic tables are developed with the following assumptions:
• the vehicle functioned correctly at the time of assembly,
• there are no multiple faults, and
• the problem currently exists.
Understanding and the correct use of the diagnostic tables are essential to reduce diagnostic time and to prevent
misdiagnosis.
Multiple DTC Fault Conditions
Some fault conditions trigger multiple component DTCs even if the fault condition exists only on a single component. If
there are multiple DTCs stored in the ECM, the service technician must view and record all DTCs logged.
The relationship between the logged DTCs can then be analysed to determine the source of the fault condition. Always
begin the diagnostic process with the DTC table of the fault condition that may trigger other DTCs to set.
The following fault conditions may trigger multiple DTCs:
• a fault in the serial data communication circuit,
• a system voltage that is too low may cause incorrect engine management system operation or engine
management component malfunction,
• a system voltage that is too high may damage the ECM and/or other engine management components,
• fault condition in the ECM read only memory (ROM) or random access memory (RAM),
• fault condition in the ECM internal circuitry or programming,
• improperly connected sensor or component wiring connector, or
• an electrical fault condition in the following shared ECM electrical circuits trigger DTCs on components or sensors
that share in the faulty shared circuit. Test the electrical circuit of the appropriate sensors or components to isolate
the fault condition. Refer to 3 W iring Diagrams and Connector Charts in this Section.
• 5 V Reference Circuit,
• Low Reference Circuit, or
• Ignition Control Voltage Circuit.
If there are no obvious faults to begin a multiple DTC fault condition diagnostic procedure, diagnose the DTCs in the
following order unless directed otherwise:
1 Always start with the lowest numbered component level DTCs such as:
• sensor DTCs,
• solenoid DTCs, or
• relay DTCs.
2 Then follow with system level DTCs such as:
• misfire DTCs,

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–5

• fuel trim DTCs, or
• catalyst DTCs.
1.3 Symptoms Diagnostics
The Diagnostic System Check directs the service technician to the symptoms diagnostics if the following conditions
exist:
• a vehicle driveability fault condition exists,
• there is no current diagnostic trouble code presently stored in the ECM, and
• all Tech 2 engine data parameters are within normal operating range.
1.4 Diagnostic Trouble Codes
The ECM constantly performs self-diagnostic tests on the engine management system. W hen the ECM detects a fault
condition in the engine operating parameters, the ECM sets a diagnostic trouble code (DTC) to represent that fault
condition. The following are the types of DTCs programmed in the ECM. In addition, DTCs are classified as either a
current or history DTC.
• Type A – emission related DTCs,
• Type B – emission related DTCs, and
• Type C – non-emission related DTCs.
NOTE
Depending on the type of DTC set, the ECM may
command the malfunction indicator lamp (MIL) to
illuminate and warn the driver there is a fault in
the engine management system.
Type A – Emission Related DTCs
The ECM takes the following action when a Type A DTC runs and fails:
• sets a current Type A DTC that represents the fault condition,
• illuminates the instrument cluster malfunction indicator lamp (MIL), and
• records the operating condition at the time the diagnostic fails and stores this information in the freeze frame
failure record.
Type B – Emission Related DTCs
The ECM takes the following action when a Type B DTC runs and fails:
• On the first time a Type B DTC fails, the ECM takes the following actions:
− sets a current Type B DTC that represents the fault condition, and
− records the operating conditions at the time the fault sets and stores this information in the failure records.
• On the second consecutive ignition cycle that a Type B DTC fails, the ECM takes the following actions:
− activates the instrument cluster malfunction indicator lamp (MIL), and
− records the operating condition at the time the diagnostic fails and stores this information in the freeze frame
failure record.
Conditions for Clearing Type A or Type B DTCs
• The current DTC clears when there is no fault condition in the current ECM self-diagnostics.
• If there are no DTCs logged after three or four consecutive ignition cycles, the ECM deactivates the instrument
cluster malfunction indicator lamp (MIL).
• Type A or Type B History DTC clears when there is no fault condition after 40 consecutive warm-up cycles.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–14

Engine Control Module Connector C-56

Figure 6C1-2 – 6
Terminal / Pin Wire Colour Circuit
Description Function
C-56–1 P/Y PW RTRN_HI_2 Ignition Voltage 1
C-56–2 GR/Y O2_HTR_3 B1S2 O2 Sensor Heater Control (Bank 1 Sensor 2)
C-56–3 P/L RUN/CRANK Ignition Voltage 1
C-56–4 Not
Used
C-56–5 Not Used
C-56–6 Not Used
C-56–7 W /B 5VDC4 5 Volt Reference 4
C-56–8 V 5VGD4 Low Reference Ground 4
C-56–9 G/B AC-PRES A/C Refrigerant Pressure Sensor Signal
C-56–10 R STOP_SW Stop Lamp Switch Signal
C-56–11 B/R AIR_TMP IAT Sensor Signal
C-56–12 Not Used
C-56–13 Not Used
C-56–14 Not Used
C-56–15 Not Used
C-56–16 Not Used
C-56–17 P/L PW RTRN_HI_1 Ignition Voltage 1
C-56–18 O/W O2_HTR_4 B2S2 O2 Sensor Heater Control (Bank 2 Sensor 2)
C-56–19 R/L FLPMP Fuel Pump Relay Control
C-56–20 BR FAN_CTL Cooling Fan Control
C-56–21 Not Used
C-56–22 B/Y SPD_4K Vehicle Speed (VSS)
C-56–23 BR/B CAN_HI_2 GMLAN Serial Data Bus – High
C-56–24 L/R PW RTRN_LO Engine Control Relay Control
C-56–25 B/Y 5VGD7 Low Reference – Ground 7
C-56–26 BR/W 5VDG1 Low Reference – Ground 1
C-56–27 Not Used

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–19

• Do not start the engine if the battery terminal is not properly secured to the battery.
• Do not disconnect or reconnect the following while the ignition is switched on or when the engine is running:
− Any engine management system component electrical wiring connector, or
− Battery terminal leads.
• Ensure the correct procedure for disconnecting and connecting engine management system electrical wiring
connectors is always followed. For information on the correct procedure for disconnecting and connecting specific
wiring connectors, refer to 6C1-3 Engine Management – V6 – Service Operations.
• Ensure that all wiring harness connectors are fitted correctly.
• W hen steam or pressure cleaning engines, do not direct the cleaning nozzle at engine management system
components.
• Do not clear any DTCs unless instructed.
• The fault must be present when using the diagnostic trouble code (DTC) diagnostic tables. Otherwise,
misdiagnosis or replacement of good parts may occur.
• Do not touch the ECM connector pins or soldered components on the ECM circuit board to prevent ECM
Electrostatic Discharge damage. Refer to 8A Electrical - Body and Chassis for information on Electrostatic
Discharge.
• Use only the test equipment specified in the diagnostic tables as other test equipment may give incorrect results or
damage good components.
• The ECM is designed to withstand normal current draw associated with vehicle operations. However, the following
fault conditions or incorrect test procedure may overload the ECM internal circuit and damage the ECM:
− A short to voltage fault condition in any of the ECM low reference circuits may cause internal ECM and / or
sensor damage. Therefore, any short to voltage fault condition in the ECM low reference circuits must be
rectified before replacing a faulty component.
− A short to ground fault condition in any of the ECM 5 V reference circuits may cause internal ECM and / or
sensor damage. Therefore, any short to ground fault condition in the ECM 5 V reference circuits must be
rectified before replacing a faulty component.
− W hen using a test lamp to test an electrical circuit, do not use any of the ECM low reference circuits or 5 V
reference circuits as a reference point. Otherwise, excessive current draw from the test lamp may damage
the ECM.
• Disregard DTCs that set while performing the following diagnostic Steps:
− Using Tech 2 actuator tests, or
− Disconnecting an engine management system sensor connector then switching on the ignition.
• After completing the required diagnostics and service operations, road test the vehicle to ensure correct engine
management system operation.
4.3 Preliminary Checks
The preliminary checks are a set of visual and physical checks or inspections that may quickly identify engine
management system fault condition.
• Refer to the appropriate Service Techlines for relevant information regarding the fault condition.
• Ensure the battery is fully charged.
• Inspect the battery connections for corrosion or a loose terminal.
• Ensure that all engine management system related fuses are serviceable.
• Inspect for incorrect aftermarket theft deterrent devices, lights or mobile phone installation.
• Ensure there is no speaker magnet positioned too close to any electronic module that contains relays.
• Inspect the engine wiring harness for proper connections, pinches or cuts.
• Ensure that all engine management related electrical wiring connectors are fitted correctly.
• Inspect the ECM ground connections for corrosion, loose terminal or incorrect position.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–20

• Ensure the resistance between the ECM housing and the battery negative cable is less than 0.5 Ω.
• Check the ECM bracket fasteners for correct torque value.
• Check all engine management related components for correct installation.
• Inspect the vacuum hoses for splits, kinks, oil contamination and proper connections, refer to the vehicle emission
control information label. Check the hoses thoroughly for any type of leak or restriction.
• Inspect the air intake ducts for being collapsed, split or for having damaged areas.
• Inspect for air leaks at the throttle body mounting area, mass air flow (MAF) sensor, intake manifold and intake
manifold sealing surfaces.
• Check for wiring harness routing that may be positioned too close to a high voltage or high current device such as
the following:
− Secondary ignition components, and
− Motors and generators.
NOTE
High voltage or high current devices may induce
electrical noise on a circuit, which can interfere
with normal circuit operation.
4.4 Diagnostic System Check
Description
The engine management diagnostic procedure is organised in a logical structure that begins with the Diagnostic System
Check. The Diagnostic System Check directs the diagnostic procedure to the logical steps necessary to diagnose an
engine driveability fault condition.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
6 Tests the integrity of the GM LAN serial data communication circuit. A PIM DTC sets if the PIM detects a fault condition in the communication circuit. A fault condition on the serial data communication circuit may trigger
multiple DTCs on other sensors and components.
Step Action Yes No
1 Have you read the basic requirements?
Go to Step 2 Refer to
4.1 Basic
Requirements
2 Have you read the diagnostic precautions?
Go to Step 3 Refer to
4.2 Diagnostic Precautions
3 Have you performed the preliminary checks?
Go to Step 4 Refer to
4.3 Preliminary Checks
4 Using Tech 2, attempt to communicate with the PIM.
Does the PIM fail to communicate? Refer to 6E1
Powertrain Interface Module – V6 Go to Step 5
5 Does DTC B3902, C0550, U2100, U2105, U2106, P0633, or P1611
also set in the PIM? Refer to 6E1
Powertrain Interface Module – V6 Go to Step 6
6 Using Tech 2, view and record DTCs set at the ECM and TCM.
Does Tech 2 display any DTC? Go to Step 7 Refer to
5.1 Symptoms
Diagnosis Table

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Management – V6 – Diagnostics Page 6C1-2–25

Checks Actions
Fuel System
• Check the fuel system for the following fault conditions. Refer to 6C Fuel System
– V6 – V6.
• restricted fuel filter,
• incorrect fuel pressure, and
• contaminated fuel.
• Check the operation of the fuel injectors. Refer to 6C1-3 Engine Management –
V6 – Service Operations.
• Perform the fuel injector balance test, refer to 6.3 Fuel Injector Balance
Test in this Section.
• Check the items that can cause an engine to run lean.
• Check the items that cause an engine to run rich.
Ignition System
• Check for an intermittent ignition circuit malfunction.
• Inspect for moisture or corrosion around the spark plug / ignition coil area.
• Test the ignition coil voltage output. Refer to 6C1-3 Engine Management – V6 –
Service Operations.
• Remove and inspect the spark plugs. Refer to 6C1-3 Engine Management – V6 –
Service Operations.
NOTE
If the spark plugs are fouled, determine the cause of the fouling before
replacing the spark plugs. Refer to 6C1-3 Engine Management – V6 –
Service Operations.
• Check for loose ignition coil ground circuit.
Engine Cooling System Check the engine for over-heating. Refer to 6B1 Engine Cooling – V6.
Engine Mechanical Check for the following engine fault conditions. Refer to 6A1 Engine Mechanical – V6.
• low compression, and
• worn valve train components.
Additional Checks
• Check the exhaust system for possible restrictions. Refer to 6F Exhaust System –
V6.
• Electromagnetic interference (EMI) on the crankshaft position (CKP) sensor can
cause an engine misfire condition.
Using Tech 2, monitor the engine speed parameter. A sudden increase in the engine speed parameters without moving the throttle position indicates that an
Electromagnetic Interference fault may be present.
W iring harness routing which may be positioned very close to a high voltage or high current device such as the following may induce EMI:
• secondary ignition components, or
• motors and generators.
Dirty starter motor commutator or brushes can mask the crankshaft position sensor signal.
• Check the torque converter clutch (TCC) operation. A TCC that applies too soon
can cause engine detonation, which will trigger spark retard activity. Refer to 7C1
Automatic Transmission – 4L60E – General Information.
When all diagnosis and repairs are completed, check the system for correct operation.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007