Page 2311 of 6020
ENGINE DRIVEABILITY AND EMISSIONS 6E–141
7 Using the DVM and check the ECT sensor signalcircuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the ECT sensor connector.
3. Check the circuit for open circuit.
Was the DVM indicated specified value?
Approximately 5.0V Go to Step 10Less than 1V:
G o t o S t e p 8 More than
specified value: Go to Step 9
8 Repair the open circuit between the ECM and ECT sensor.
Was the problem solved?
— Verify repair Go to Step 14
9 Repair the short to voltage circuit between the ECM and ECT sensor.
Was the problem solved?
— Verify repair Go to Step 14
10 Using the DVM and check the ECT sensor ground circuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the ECT sensor connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
Less than 1V Go to Step 11Repair faulty
harness and verify repair
Step
Action Value(s) Yes No
V
E69
1
E60(J1) E69
27
1
E60(J1) E69
27
1
V
E69
2
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ISUZU KB P190 2007
Page 2312 of 6020
6E–142 ENGINE DRIVEABILITY AND EMISSIONS
11 Using the DVM and check the ECT sensor groundcircuit.
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 ECT sensor connector.
4. Check the circuit for open circuit.
Was the problem found?
Breaker box is not available: 1. Ignition “Off”, engine “Off”.
2. Disconnect the ECT sensor connector.
3. Check the circuit for open circuit.
Was the problem found?
—Repair faulty
harness and verify repair Go to Step 14
12 Substitute a known good ECT sensor assembly and recheck.
Was the problem solved? — Go to Step 13Go to Step 14
13 Replace the ECT sensor. Is the action complete? — Verify repair —
14 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 15
15 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
J1-32Breaker Box
Ω
E-692
232E60(J1)E69
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ISUZU KB P190 2007
Page 2314 of 6020
6E–144 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0122 Throttle Position Sensor 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 P0122 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 P0122 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 TPS or ECM connector. If a poor/faulty connection is found, repair
as necessary.
Was the problem found?
— Verify repair Go to Step 5
5 Visually check the TPS. Was the problem found? — Go to Step 10Go to Step 6
6 Using the DVM and check the TPS. 1. Ignition “Off”, engine “Off”.
2. Disconnect TPS connector.
3. Measure the resistance of TPS.
Does the tester indicate standard resistance as shown
in the following table?
Standard
resistance Go to Step 7Go to Step 10
E60(J1) E68
32 15
7
Measurement Terminal Resistance (
Ω)
1 - 2 Approximately 5.6k Ω at idle position &
WOT
2 - 3 Approximately 6.0k Ω at idle position
Approximately 1.7k Ω at WOT
1 - 3 Approximately 2.3k Ω at idle position &
WOT
Approximately 6.6k Ω at WOT
21
3
TPS
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ISUZU KB P190 2007
Page 2315 of 6020
ENGINE DRIVEABILITY AND EMISSIONS 6E–145
7 Using the DVM and check the TPS power supplycircuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the TPS connector.
3. Check the circuit for open or short to ground circuit.
Was the DVM indicated specified value?
Approximately 5.0V Go to Step 9Go to Step 8
8 Repair the open or short to ground circuit between the ECM and TPS.
Was the problem solved?
— Verify repair Go to Step 12
Step
Action Value(s) Yes No
V
E68
2
2E60(J1) E68
15
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ISUZU KB P190 2007
Page 2316 of 6020
6E–146 ENGINE DRIVEABILITY AND EMISSIONS
9 Using the DVM and check the TPS 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 TPS connector.
4. Check the circuit for open, short to sensor ground or short to ground circuit.
Was the problem found?
Breaker box is not available: 1. Ignition “Off”, engine “Off”.
2. Disconnect the TPS connector and ECM connector.
3. Check the circuit for open, short to sensor ground or short to ground circuit.
Was the problem found?
—Repair faulty
harness and verify repair Go to Step 12
10 Substitute a known good TPS and recheck. Was the problem solved? — Go to Step 11Go to Step 12
11 Replace the TPS. Is the action complete? — Verify repair-
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 12
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
J1-7J1-32
Ω
Breaker BoxE-86
Ω
3333
Ω
3273E60(J1) E68
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ISUZU KB P190 2007
Page 2318 of 6020
6E–148 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0123 Throttle Position Sensor High 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 P0123 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 P0123 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 TPS or ECM connector. If a poor/faulty connection is found, repair
as necessary.
Was the problem found?
— Verify repair Go to Step 5
5 Visually check the TPS. Was the problem found? — Go to Step 12Go to Step 6
6 Using the DVM and check the TPS. 1. Ignition “Off”, engine “Off”.
2. Disconnect TPS connector.
3. Measure the resistance of TPS.
Does the tester indicate standard resistance as shown
in the following table?
Standard
resistance Go to Step 7Go to Step 12
E60(J1) E68
32 15
7
Measurement Terminal Resistance (
Ω)
1 - 2 Approximately 5.6k Ω at idle position &
WOT
2 - 3 Approximately 6.0k Ω at idle position
Approximately 1.7k Ω at WOT
1 - 3 Approximately 2.3k Ω at idle position &
WOT
Approximately 6.6k Ω at WOT
21
3
TPS
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ISUZU KB P190 2007
Page 2319 of 6020
ENGINE DRIVEABILITY AND EMISSIONS 6E–149
7 Using the DVM and check the TPS power supplycircuit.
1. Ignition “On”, engine “Off”.
2. Disconnect the TPS connector.
3. Check the circuit for short to voltage circuit.
Was the DVM indicated specified value?
Approximately 5.0V Go to Step 9Go to Step 8
8 Repair the short to voltage circuit between the ECM and TPS.
Was the problem solved?
— Verify repair Go to Step 14
9 Using the DVM and check the TPS signal circuit. 1. Ignition “On”, engine “Off”.
2. Disconnect the TPS connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
Less than 1V Go to Step 10Repair faulty
harness and verify repair
10 Using the DVM and check the TPS ground circuit. 1. Ignition “On”, engine “Off”.
2. Disconnect the TPS connector .
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
Less than 1V Go to Step 11Repair faulty
harness and verify repair
Step
Action Value(s) Yes No
V
E68
2
2E60(J1) E68
15
3
V
E68
1
V
E68
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ISUZU KB P190 2007
Page 2320 of 6020
6E–150 ENGINE DRIVEABILITY AND EMISSIONS
11 Using the DVM and check the TPS ground 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 TPS connector.
4. Check the circuit for open circuit.
Was the problem found?
Breaker box is not available: 1. Ignition “Off”, engine “Off”.
2. Disconnect the TPS connector and ECM connector.
3. Check the circuit for open circuit.
Was the problem found?
—Repair faulty
harness and verify repair Go to Step 14
12 Substitute a known good TPS and recheck. Was the problem solved? — Go to Step 13Go to Step 14
13 Replace the TPS. Is the action complete? — Verify repair —
14 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 14
15 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
J1-32Breaker BoxE-86
Ω
1
11
1
321E60(J1)
E68
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ISUZU KB P190 2007
