Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 121

6E–88

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

P0400

Exhaust Gas Recirculation Flow
Excessive Detected

1. Intake air temperature is
between 15°C and 100°C.
2. Engine coolant temperature is
between 35°C and 100°C.
3. Barometric pressure is between
850hpa and 1100hpa.
4. Small amount of mass air flow.
(Desired mass air flow - mass air
flow is more than 150mg/strk)

Fuel injection quantity is
reduced.

1. Engine speed is between 1500rpm
and 3200rpm.
2. Injection quantity is below 40mg/stk.
3. Correct amount of mass air flow.

1. EGR valve is stuck at open posi-
tion.
2. EGR EVRV malfunction.
3. Air intake is obstructed.
4. Air intake is leaking.
5. MAF sensor malfunction.
6. ECM malfunction.

88/97

Exhaust Gas Recirculation Circuit
Short to Ground or Open Circuit

EGR EVRV circuit open or short to
ground circuit.

Fuel injection quantity is reduced
and EGR EVRV 10% conditions
as substitute.

EGR EVRV circuit is correct condition.

1. EGR EVRV circuit open or short to
ground circuit.
2. EGR EVRV malfunction.
3. ECM malfunction.

Exhaust Gas Recirculation Flow Insuf-
ficient Detected

1. Intake air temperature is
between 15°C and 100°C.
2. Engine coolant temperature is
between 35°C and 100°C.
3. Barometric pressure is between
850hpa and 1100hpa.
4. Large mount of mass air flow.
(Desired mass air flow - mass air
flow is below 150 mg/strk)

Fuel injection quantity is
reduced.

1. Engine speed is between 1500rpm
and 3200rpm.
2. Injection quantity is below 40mg/stk.
3. Correct amount of mass air flow.

1. EGR valve is stuck at close posi-
tion.
2. EGR valve operating vacuum hose
is clogged or disconnected.
3. EGR EVRV malfunction.
4. MAF sensor signal circuit short to
voltage circuit.
5. MAF sensor malfunction.
6. ECM malfunction.

88/97

Exhaust Gas Recirculation Circuit
Short to Battery

EGR EVRV circuit short to voltage
circuit.

Fuel injection quantity is reduced
& EGR EVRV 10% conditions as
substitute.

EGR EVRV circuit is correct condition.

1. EGR EVRV circuit short to voltage
circuit.
2. EGR EVRV malfunction.
3. ECM malfunction.

P0500

ON at

next
igni-

tion

cycle

Vehicle Speed Sensor Circuit High
Input

Vehicle speed is more than
200km/h.

ECM uses vehicle speed 5km/h
condition as substitute.

Vehicle speed is below 200km/h.

1. VSS signal circuit open, short to
ground or short to voltage circuit.
2. VSS malfunction.
3. Speed meter malfunction.
4. TCM malfunction (A/T 2WD).
5. ECM malfunction.

ON at

next
igni-

tion

cycle

Vehicle Speed Sensor Input Signal
Frequency Too High

Input signal frequency is too high.

ECM uses vehicle speed 5km/h
condition as substitute.

Correct vehicle speed signal frequency. 1. VSS malfunction.

2. Speed meter malfunction.
3. Electrical interference.
4. Magnetic interference.
5. ECM malfunction.

ON at

next
igni-

tion

cycle

Vehicle Speed Sensor Incorrect Sig-
nal

1. Engine speed is more than
3600rpm.
2. Fuel injection quantity is more
than 41mg/stk.
3. Vehicle speed is below 1.5km/h.

Fuel injection quantity is
reduced.

Vehicle speed is more than 1.5km/h.

1. VSS open circuit, short to ground
or short to voltage.
2. Poor connector connection.
3. VSS malfunction.
4. Speed meter malfunction.
5. ECM malfunction.

Flash

Code

Symptom

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

Recovery Condition

Related Failure Parts

Related

ECM Pin

No.

Related

Multiple

DTC

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–89

P0560

OFF

System Voltage Too High

System voltage is more than 20V.

ECM uses 9V conditions as sub-
stitute.

System voltage is below 20V.

1. Charge system malfunction.
2. Battery jump start cable miscon-
nect.
3. ECM malfunction.

3/39

OFF

System Voltage Too Low

System voltage is below 7V.

System voltage is more than 7V.

1. Battery power feed harness open
circuit or short to ground circuit.
2. ECM ground harness open or poor
connection.
3. Poor connector connection.
4. Battery malfunction.
5. Charge system malfunction.
6. ECM malfunction.

3/39

OFF

System Voltage Malfunction (PSG)

System voltage of PSG (pump
control unit) is below 4.5V or more
than 27V.

PSG uses default voltage as sub-
stitute.

System voltage of PSG is between 4.5V
and 27V.

1. Battery power feed harness open
circuit or short to ground circuit.
2. PSG (pump control unit) ground
harness open or poor connection.
3. Poor connector connection.
4. Battery malfunction.
5. Charge system malfunction.
6. Battery jump start cable miscon-
nect.
7. PSG (pump control unit) malfunc-
tion.

P0561

OFF

Ignition Switch Circuit Malfunction

The ECM recognized ignition
switch turn off signal during ECM
is activated.

ECM stops engine.

No recovery until condition match in the
next ignition key cycle.

1. Ignition switch circuit open or short
to ground circuit.
2. Poor connector connection.
3. Ignition switch malfunction.
4. ECM malfunction.

Ignition Switch Circuit Malfunction

Ignition switch circuit is malfunc-
tion.

1. Ignition switch circuit open or short
to ground circuit.
2. Poor connector connection.
3. Ignition switch malfunction.
4. ECM malfunction.

P0602

ECU Programming Error

ECM memory area error.

Engine control disabled.

Memory are is OK.

ECM is not programmed.

P0606

ECU Malfunction

Gate Array communication error.

1. MAB (fuel cutoff solenoid
valve) is operated.
2. Desired injection quantity
becomes 0mg/strk.

No recovery.

ECM malfunction.

ECU Malfunction

1. Throttle position is below 1%.
2. Desired injection quantity is
more than 0mg/strk.
3. Engine speed is more than
2000rpm.

MAB (fuel cutoff solenoid valve)
is operated.

Desired injection quantity is below 0mg/
strk.

1. ECM malfunction.
2. PSG (pump control unit) malfunc-
tion.

Flash

Code

Symptom

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

Recovery Condition

Related Failure Parts

Related

ECM Pin

No.

Related

Multiple

DTC

6E–90

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

P0645

A/C Compressor Relay Circuit Voltage
Low

A/C compressor relay circuit open
or short to ground circuit.

No fail-safe function.

A/C compressor relay circuit is correct
condition.

1. A/C compressor relay circuit open
or short to ground circuit.
2. Poor connector connection.
3. A/C compressor relay malfunction.
4. ECM malfunction.

A/C Compressor Relay Circuit Voltage
High

A/C compressor relay circuit short
to voltage circuit.

ECM malfunction.

P0703

Brake Switch Malfunction

1. Throttle position is more than
0%.
2. Engine speed is more than
665rpm.
3. Vehicle speed is more than
0km/h.
4. Brake switch 1 signal and brake
switch 2 signal are differently
inputted to the ECM since the igni-
tion switch was turned on.

No fail-safe function.

Brake switch 1 signal and brake switch 2
signal are correctly inputted to the ECM.

1. Brake switch 1 circuit open, short to
ground or short to voltage circuit.
2. Poor connector connection.
3. Brake switch 1 malfunction.
4. ECM malfunction.

Brake Switch Malfunction

1. Throttle position is more than
0%.
2. Engine speed is more than
665rpm.
3. Vehicle speed is more than
0km/h.
4. Brake switch 1 signal and brake
switch 2 signal are differently
inputted to the ECM.

1. Brake switch 2 circuit open or short
to ground circuit.
2. Poor connector connection.
3. Brake switch 2 malfunction.
4. ECM malfunction.

P0704

Clutch Switch Input Circuit Malfunc-
tion

Clutch signal does not change
between vehicle speed 1.5km/h
and 80km/h since ignition switch
was tuned on.

No fail-safe function.

Clutch signal correctly changes.

1. Clutch switch circuit open, short to
ground or short to voltage circuit.
2. Poor connector connection.
3. Clutch switch malfunction.
4. ECM malfunction.

P1105

Barometric Pressure Sensor Circuit
High Input

Barometric pressure sensor output
voltage is more than 4.4V.

ECM uses 1013hpa condition as
substitute.

Barometric pressure sensor output volt-
age is below 4.4V.

ECM malfunction.

Barometric Pressure Sensor Circuit
Low Input

Barometric pressure sensor output
voltage is below 1.5V.

Barometric pressure sensor output volt-
age is more than 1.5V.

ECM malfunction.

Flash

Code

Symptom

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

Recovery Condition

Related Failure Parts

Related

ECM Pin

No.

Related

Multiple

DTC

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–91

P1120

Pedal/Throttle Position Sensor Circuit
High Input

Throttle position sensor output
voltage is more than 4.5V.

ECM increases idle speed up to
1400rpm.

Throttle position sensor output voltage is
below 4.5V.

1. Sensor power supply circuit short
to voltage circuit.
2. Sensor signal circuit short to volt-
age circuit.
3. Sensor ground circuit open or short
to voltage circuit.
4. Poor connector connection.
5. TPS malfunction.
6. ECM malfunction.

38/ 49/ 57

Pedal/Throttle Position Sensor Volt-
age Supply Circuit High Input

Throttle position sensor power
supply voltage is more than 5.2V.

Throttle position sensor power supply
voltage is below 5.2V.

1. Sensor power supply circuit short
to battery voltage circuit.
2. TPS malfunction.
3. ECM malfunction.

Pedal/Throttle Position Sensor Volt-
age Supply Circuit Low Input

Throttle position sensor power
supply voltage is below 4.6V.

Throttle position sensor power supply
voltage is more than 4.6V.

1. Sensor power supply circuit short
to ground circuit.
2. TPS malfunction.
3. ECM malfunction.

Pedal/Throttle Position Sensor Brake
Switch Error

1. Engine speed is more than
1700rpm.
2. Vehicle speed is more than
1.5km/h.
3. When brake pedal is depressed
during accelerator pedal is
depressing.

Throttle position is more than 20% or
brake pedal is released (switch is inac-
tive).

1. Throttle sticking.
2. TPS incorrect adjusting.
3. TPS malfunction.
4. Brake switch malfunction.
5. ECM malfunction.

30/ 38/ 65

Pedal/Throttle Position Sensor Idle
Position Switch Error

1. When idle switch is turned off,
throttle position sensor was below
0.35%.
or
2. When idle switch is tuned on,
throttle position sensor was more
than 7.8%.

1. When throttle position sensor is
100%, idle switch turns off.
2. When throttle position sensor is 0%,
idle switch turns on.

1. TPS malfunction.
4. Idle switch malfunction.
5. ECM malfunction.

38/ 69

P1173

OFF

Fuel Reduction Caused By High Cool-
ant Temperature

Excessive high engine coolant
temperature is detected.

No fail-safe function.

Engine coolant temperature is normal
range.

1. Engine overheat.
2. ECT sensor malfunction.
3. ECM malfunction.

OFF

Fuel Reduction Caused By High Fuel
Temperature

Fuel temperature is more than
100°C.

PSG (pump control unit) controls
fuel injection quantity based on
engine speed and fuel tempera-
ture.

Fuel temperature is below 100°C.

1. ECM malfunction.
2. PSG (pump control unit) malfunc-
tion.

Flash

Code

Symptom

Code

MIL

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

Recovery Condition

Related Failure Parts

Related

ECM Pin

No.

Related

Multiple

DTC

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