2007 ISUZU KB P190 Workshop Repair Manual

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Page 2257 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE DRIVEABILITY AND EMISSIONS 6E–87
HOW TO USE BREAKER BOX
The engine control module (ECM) and other connectors
have water proof connector and special terminal. Water
proof terminal does not al

Page 2258 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E–88 ENGINE DRIVEABILITY AND EMISSIONS
Breaker Box Connection Type A
Breaker box connection type A, check for “open circuit”
and “short to ground circuit”.
51 43 2
(1) Engine Control Modu

Page 2259 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE DRIVEABILITY AND EMISSIONS 6E–89
Breaker Box Connection Type B
Breaker box connection type B, check for “short to
power supply circuit” and “power, signal voltage check”
between the

Page 2260 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E–90 ENGINE DRIVEABILITY AND EMISSIONS
ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK
Circuit Description
The on-board diagnostic system check is the starting
point for any driveability complaint diagnosi

Page 2261 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE DRIVEABILITY AND EMISSIONS 6E–91
ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK
StepAction Value(s) Yes No
1 1. Ignition “On”, engine “Off”. 2. Check the “CHECK ENGINE” lamp (MIL).
Does

ENGINE DRIVEABILITY AND EMISSIONS 6E–91
ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK
StepAction Value(s) Yes No
1 1. Ignition “On”, engine “Off”. 2. Check the “CHECK ENGINE” lamp (MIL).
Does the “CHECK ENGINE” lamp turn “On”? — Go to Step 2Go to
No
CHECK
ENGINE Lamp
2 1. Using the Tech 2, ignition “On” and engine “Off”. 2 . A t t e m p t t o d i s p l a y “ E n g i n e D a t a ” w i t h t h e T e c h 2 .
Does the Tech 2 display “Engine Data” and “O
2Sensor Data”? — Go to Step 3Go to Step 7
3 1. Using the Tech 2, ignition “On” and engine “Off”. 2. Select the “Miscellaneous Test” and perform the“Malfunction Indicator Lamp” in “Lamps”.
3. Operate the Tech 2 in accordance with the Tech 2 instructions.
Does the “CHECK ENGINE” lamp turn “Off”? — Go to Step 4Go to
CHECK
ENGINE LAMP On Steady
4 Attempt to start the engine. Does the engine start and continue to “Run”? —Go to Step 5Go to
Engine
Cranks But Will Not Run
5 1. Using the Tech 2, ignition “On” and engine “Off”. 2. Select the “Read DTC Infor By Priority” in“Diagnostic Trouble Code”.
3. Are any DTCs stored? —Go to
DTC
Chart Go to Step 6
6 Compare typical scan data values displayed on the Tech 2 “Engine Data” and “O
2 Sensor Data”.
Are the displayed values within the range? —Refer to
SYMPTOM
DIAGNOSIS Refer to
TYPICAL
SCAN DATA
7 Using the DVM and check the data link connector power supply circuit.
1. Ignition “Off”, engine “Off”.
2. Check the circuit for open circuit.
Was the problem found?
—Repair faulty
harness and verify repair Go to Step 8
8 Using the DVM and check the data link connector ground circuit.
1. Ignition “Off”, engine “Off”.
2. Check the circuit for open circuit.
Was the problem found?
—Repair faulty
harness and verify repair Go to Step 9
V
16
B58
5
4B58

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ISUZU KB P190 2007

Page 2262 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E–92 ENGINE DRIVEABILITY AND EMISSIONS
9 Using the DVM and check the data link connectorground circuit.
1. Ignition “On”, engine “Off”.
2. Check the circuit for short to power supply circ

Page 2263 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE DRIVEABILITY AND EMISSIONS 6E–93
13 Replace the ECM. Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in

Page 2264 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6E–94 ENGINE DRIVEABILITY AND EMISSIONS
NO CHECK ENGINE LAMP (MIL)
Circuit Description
The check engine lamp should be illuminated and
steady for about five seconds with the ignition “ON” and
t

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