2007 ISUZU KB P190 ignition

6E–188 ENGINE DRIVEABILITY AND EMISSIONS
6 Using the DVM and check the ignition coil modulesignal circuit for the affected coil.
1. Ignition “On”, engine “Off”.
2. Disconnect the ignition coil module connector.
3. Check the circuit for short to battery voltage circuit for the affected coil.
Was the DVM indicated battery voltage?
—Repair faulty
harness and verify repair Go to Step 7
Step Action Value(s) Yes No
E-181
11
1 Coil 2
V
E-183
33
3
Coil 1
V

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ISUZU KB P190 2007

ENGINE DRIVEABILITY AND EMISSIONS 6E–189
7 Using the DVM and check the ignition coil signalcircuit for the affected coil.
Breaker box is available:
1. Ignition “Off”, engine “Off”.
2. Install the breaker box as type A. (ECM disconnected) Refer to 6E-88 page.
3. Disconnect the ignition coil module connector.
4. Check the circuit for open or short to ground circuit for the affected coil.
Was the problem found?
Breaker box is not available: 1. Ignition “Off”, engine “Off”.
2. Disconnect the ignition coil module connector and ECM connector.
3. Check the circuit for open or short to ground circuit for the affected coil.
Was the problem found?
—Repair faulty
harness and verify repair Go to Step 8
Step Action Value(s) Yes No
J1-18Breaker BoxE-181Coil 2
ΩΩ
J1-19Breaker BoxE-183Coil 1
ΩΩ
E-181
Coil 2
ΩΩ
E-60(J1)1
8
E-183
Coi l 1
ΩΩ
E-60(J1)19

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ISUZU KB P190 2007

6E–190 ENGINE DRIVEABILITY AND EMISSIONS
8 Using the DVM and check the ignition coil modulepower supply circuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the ignition coil module connector.
3. Check the circuit for open circuit.
Was the DVM indicated specified value?
10 - 14.5V Go to Step 10Go to Step 9
9 Repair the open or short to ground circuit between the “IGN. Coil” fuse (15A) and ignition coil module.
Is the action complete? — Verify repair —
10 Replace the ignition coil module. Was the problem solved? — Verify repair Go to Step 11
11 Is the ECM programmed with the latest software release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved? — Verify repair Go to Step 12
12 Replace the ECM. Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure. — Verify repair —
Step
Action Value(s) Yes No
V
E-18
2

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ISUZU KB P190 2007

6E–192 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0443
EVAP Emission Control System Purge Control Circuit
Step Action Value(s) Yes No
1 Was the “On-Board Diagnostic (OBD) System Check” performed?
—Go to Step 2Go to
On Board
Diagnostic
(OBD) System Check
2 1. Connect the Tech 2. 2. Review and record the failure information.
3. Select “F0: Read DTC Infor By Priority” in “F0: Diagnostic Trouble Code”.
Is the DTC P0443 stored as “Present Failure”? — Go to Step 3Refer to
Diagnostic Aids and Go to Step
3
3 1. Using the Tech2, ignition “On” and engine “Off”. 2. Select “Clear DTC Information” with the Tech2 andclear the DTC information.
3. Operate the vehicle and monitor the “F5: Failed This Ignition” in “F2: DTC Information”.
Was the DTC P0443 stored in this ignition cycle? — Go to Step 4Refer to
Diagnostic Aids and Go to Step
4
4 Check for poor/faulty connection at the purge solenoid valve or ECM connector. If a poor/faulty connection is
found, repair as necessary.
Was the problem found?
— Verify repair Go to Step 5
5 Using the DVM and check the purge solenoid valve. 1. Ignition “Off”, engine “Off”.
2. Disconnect purge solenoid valve connector.
3. Measure the resistance of purge solenoid valve coil.
Does the tester indicate standard resistance?
25 - 30Ω at
20°C Go to Step 6Go to Step 9
5
E-60(J1)
E-66
21
EVAP Purge Solenoid
Ω
12

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ISUZU KB P190 2007

ENGINE DRIVEABILITY AND EMISSIONS 6E–193
6 Using the DVM and check the purge solenoid valvepower supply circuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the purge solenoid valve connector.
3. Check the circuit for open circuit.
Was the DVM indicated specified value?
10 - 14.5V Go to Step 8Go to Step 7
7 Repair the open or short to ground circuit between the “Engine” fuse (15A) and purge solenoid valve.
Is the action complete? — Verify repair -
8 Using the DVM and check the purge solenoid valve solenoid signal circuit.
Breaker box is available:
1. Ignition “Off”, engine “Off”.
2. Install the breaker box as type A. (ECM disconnected) Refer to 6E-88 page.
3. Disconnect the purge solenoid valve connector.
4. Check the circuit for open or short to ground circuit.
Was the problem found?
Breaker box is not available:
1. Ignition “Off”, engine “Off”.
2. Disconnect the purge solenoid valve connector and ECM connector.
3. Check the circuit for open or short to ground circuit.
Was the problem found?
—Repair faulty
harness and verify repair Go to Step 9
Step Action Value(s) Yes No
V
E-66
2
J1-5Breaker BoxE-66
Ω
1
E-66
E-60(J1)
51

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ISUZU KB P190 2007

6E–194 ENGINE DRIVEABILITY AND EMISSIONS
9 Using the DVM and check the purge solenoid valvesignal circuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the purge solenoid valve connector.
3. Check the circuit for short to voltage circuit.
Was the DVM indicated voltage?
—Repair faulty
harness and verify repair Go to Step 10
10 Substitute a known good purge solenoid valve and recheck.
Was the problem solved? — Go to Step 11Go to Step 12
11 Replace the purge solenoid valve. Was the problem solved? — Verify repair Go to Step 12
12 Is the ECM programmed with the latest software release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved? — Verify repair Go to Step 13
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 this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure. — Verify repair —
Step
Action Value(s) Yes No
V
E-66
1

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ISUZU KB P190 2007

ENGINE DRIVEABILITY AND EMISSIONS 6E–195
DIAGNOSTIC TROUBLE CODE (DTC) P0502 VEHICLE SPEED SENSOR (VSS) CIRCUIT LOW INPUT
Condition for setting the DTC and action taken when the DTC sets
Circuit Description
The vehicle speed sensor has a magnet rotated by the
transmission output shaft. Attached to the sensor is a
hall effect circuit that interacts with the magnetic field
created by the rotating magnet. A 12-volt operating
supply for the speed sensor hall circuit is supplied from
the meter fuse.
Diagnostic Aids
• Poor connection at ECM: Inspect harness connectors for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.
Code Type DTC Name DTC Setting Condition Fail-Safe (Back Up)
P0502 B Vehicle Speed Sensor Circuit Low Input 1. No DTC relating to MAP sensor, TPS, ECT
sensor, injector control circuit and ignition
control circuit.
2. Engine is running.
3. Vehicle speed is below 3km/h in power condition or 2km/h in deceleration condi-
tion. ECM uses 0km/h condition as substitute.

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ISUZU KB P190 2007

6E–196 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0502 Vehicle Speed Sensor Circuit Low Input
StepAction Value(s) Yes No
1 Was the “On-Board Diagnostic (OBD) System Check” performed?
—Go to Step 2Go to
On Board
Diagnostic
(OBD) System Check
2 1. Connect the Tech 2. 2. Review and record the failure information.
3. Select “F0: Read DTC Infor By Priority” in “F0: Diagnostic Trouble Code”.
Is the DTC P0502 stored as “Present Failure”? — Go to Step 3Refer to
Diagnostic Aids and Go to Step
3
3 1. Using the Tech2, ignition “On” and engine “Off”. 2. Select “Clear DTC Information” with the Tech2 andclear the DTC information.
3. Operate the vehicle and monitor the “F5: Failed This Ignition” in “F2: DTC Information”.
Was the DTC P0502 stored in this ignition cycle? — Go to Step 4Refer to
Diagnostic Aids and Go to Step
4
4 Check for poor/faulty connection at the VSS, meter, immobilizer control unit (if equipped), ECM and other
connectors. If a poor/faulty connection is found, repair
the faulty terminal.
Was the problem found?
— Verify repair Go to Step 5
5 Remove the VSS from the housing case and visually check.
Was the problem found? — Go to Step 19Go to Step 6
6 8
23
27
910
C-56(J2)
B-68
B-24
E-44

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ISUZU KB P190 2007