Serial No. Operation steps Results Follow-ups
1 Switch on diagnosis instrument and commutator, and place ignition switch to “ON”. Next step
Yes To step 4
2 Take out connector of phase sensor of the harness, and check voltage between 3# and 1# pins of phase sensor connector is around 12V.
No Next step
Yes Repair or replace harness 3
Check lines between 3# pin of phase sensor and 87# pin of main relay are opened or shorted to earth;
Check 1# pin of phase sensor is poorly earthed.
No Next step
Yes To step 6
4 Check voltage between 2# pin of phase sensor connector and cathode of power source is about 9.9V.
No Next step
Yes Repair or replace harness 5 check lines between 2# pin of phase sensor connector and 79# pin of ECU are opened or shorted to power source or earth;
No Next step
Yes Diagnosis help
6 Check signal panel of camshaft is good.
No.095 Malfunction code: P0443 "Malfunction of control circuit of driver
stage of canister control valve"
Serial No. Operation steps Results Follow-ups
1 Switch on diagnosis instrument and commutator, and place ignition switch to “ON”. Next step
Yes To step 4
2
Take out connector of canister control valve of the harness, and check voltage between 1# pin of this connector and cathode of power source is around 12V with the multimeter.
No Next step
Yes Repair or replace harness 3 Check lines at power supply terminal of canister control valve are opened or shorted to ground.
No To step 2
Yes Next step
4 Check resistance between 1# and 2# pins of canister control valve is between 22~30Ω under 20℃with the multimeter.
No Replace control valve
Yes Diagnosis help
5 Check voltage between 1# pin of connector of canister control valve and cathode of power source is around 3.7V with the multimeter.
No Next step
Yes Repair or replace harness 6 Check lines between 2# pin of connector of canister control valve and 46# pin of ECU are open shorted.
No Diagnosis help
No.096 Malfunction code: P0444 "voltage of control circuit of driver
stage of canister control valve too low"
Serial No. Operation steps Results Follow-ups
Yes Next step 4 Check resistance between 1# and 2# pins of canister control valve is between 22~30Ω under 20℃with the multimeter.
No Replace control valve
Yes Diagnosis help
5 Check voltage between 1# pin of connector of canister control valve and cathode of power source is around 3.7V with the multimeter.
No Next step
Yes Repair or replace harness 6 Check lines between 2# pin of connector of canister control valve and 46# pin of ECU are shorted to ground.
No Diagnosis help
No.097 Malfunction code: P0445 "voltage of control circuit of driver
stage of canister control valve too high"
Serial No. Operation steps Results Follow-ups
1 Switch on diagnosis instrument and commutator, and place ignition switch to “ON”. Next step
Yes To step 4
2
Take out connector of canister control valve of the harness, and check voltage between 1# pin of this connector and cathode of power source is around 12V with the multimeter.
No Next step
Yes Repair or replace harness 3 Check lines at power supply terminal of canister control valve are opened or shorted to ground.
No To step 2
Yes Next step
4 Check resistance between 1# and 2# pins of canister control valve is between 22~30Ω under 20℃with the multimeter.
No Replace control valve
Yes Diagnosis help
5 Check voltage between 1# pin of connector of canister control valve and cathode of power source is around 3.7V with the multimeter.
No Next step
Yes Repair or replace harness 6 Check lines between 2# pin of connector of canister control valve and 46# pin of ECU are shorted to power source.
No.098 Malfunction code: P0480 "malfunction control circuit of cooling
fan relay of AC condenser"
Serial No. Operation steps Results Follow-ups
1 Switch on diagnosis instrument and commutator, and place ignition switch to “OFF”. Next step
Yes To step 4
2
Take out cooling fan relay of AC condenser, and place ignition switch at “ON”, and check voltage between power supply terminal of this relay, i.e. 30# and 85# pins of relay and cathode of power source is around 12V.
No Next step
Yes Repair or replace harness 3 Check lines at power supply terminal of cooling fan relay of AC condenser are opened or shorted to ground.
No To step 2
Yes Replace relay
4 Check voltage between control terminal of cooling fan relay of AC condenser this relay, i.e. 86# pin of relay and cathode of power source is around 3.7V.
No Next step
Yes Repair or replace harness 5 Check lines between 86# pin of control terminal of relay and 50# pin of ECU are opened or shorted to power source or ground.
No Diagnosis help
No.099 Malfunction code: P0500 "unreasonable malfunction of speed
signal"
Serial No. Operation steps Results Follow-ups
1 Switch on diagnosis instrument and commutator, and place ignition switch to “OFF”. Next step
Yes Repair ABS system 2 If vehicle is equipped with ABS system, check ABS system has malfunction code.
Yes Repair or replace harness 4 Check lines between sensor signal line and 59# pin of ECU are opened or shorted to power source or ground.
No Diagnosis help
No.100 Malfunction code: P0506 "idling speed lower than target speed
value"
Serial No. Operation steps Results Follow-ups
1 Switch on diagnosis instrument and commutator, and place ignition switch to “OFF”. Next step
Yes Next step
2 Check adjusting screw, throttle dragline and condition of throttle work normally. No
Repair and maintain as necessary
Yes Next step
3 Check idling speed governor works normally.
No Repair and maintain as necessary
Yes Repair as necessary
4
A. Check pressure of oil supply system is too low; B. Check oil injector is blocked;
C. Check the system is well exhausted. No Diagnosis help
No.101 Malfunction code: P0507 "idling speed higher than target speed
value"
Serial No. Operation steps Results Follow-ups
1 Switch on diagnosis instrument and commutator, and place ignition switch to “OFF”. Next step
Yes Next step
2 Check adjusting screw, throttle dragline and condition of throttle work normally.
No Repair and maintain as necessary
Yes Next step
3 Check idling speed governor works normally.
No Repair and maintain as necessary
Yes Repair as necessary 4 A. Check the system is exhausted; B. Check oil injector is blocked; C. Check pressure of oil supply system is too high.
No Diagnosis help
No.102 Malfunction code: P0508 "voltage of control circuit of idling
speed governor too low"
1 Switch on diagnosis instrument and commutator, and place ignition switch to “ON”. Next step
Yes Next step
2 Take out connector of idling speed governor, and check resistance between A and D, B and C pins is around 53±5.3Ω under 20 with the multimeter.℃
No Replace stepper motor
Yes Repair or replace harness 3 Check lines among A, B, C D pins of idling speed governor and 65#, 66#, 67#, 64# pins of ECU are shorted to ground.
No Diagnosis help
No.103 Malfunction code: P0509 "voltage of control circuit of idling
speed governor too high"
Serial No. Operation steps Results Follow-ups
1 Switch on diagnosis instrument and commutator, and place ignition switch to “ON”. Next step
Yes Next step
2 Take out connector of idling speed governor, and check resistance between A and D, B and C pins is around 53±5.3Ω under 20 with the multimeter.℃
No Replace stepper motor
Yes Repair or replace harness 3 Check lines among A, B, C D pins of idling speed governor and 65#, 66#, 67#, 64# pins of ECU are shorted to power source.
No Diagnosis help
No.104 Malfunction code: P0511 "malfunction control circuit of idling
speed governor"
Serial No. Operation steps Results Follow-ups
1 Switch on diagnosis instrument and commutator, and place ignition switch to “ON”. Next step
Yes Next step
2 Take out connector of idling speed governor, and check resistance between A and D, B and C pins is around 53±5.3Ω under 20 with the multimeter.℃
No Replace stepper motor
Yes Repair or replace harness 3 Check lines among A, B, C D pins of idling speed governor and 65#, 66#, 67#, 64# pins of ECU are opened.
Yes Repair or replace harness 3 Check lines among 44#, 45#, 63# pins of ECU and 87# pin of main relay are opened or shorted to ground.
No Next step
Yes Next step
4 Start the engine, and check charging voltage of generator is between 9-16V within different speed range.
No Replace generator
Yes Diagnosis help
5 Check earth point of engine harness is good.
No Repair or replace harness
No.106 Malfunction code: P0562 "system voltage too low"
Serial No. Operation steps Results Follow-ups
1 Switch on diagnosis instrument and commutator, and place ignition switch to “OFF”. Next step
Yes Next step
2 Check battery voltage is around 12V with the multimeter.
No Replace battery cell
Yes Repair or replace harness 3 Check resistance of lines between 44#, 45#, 63# pins of ECU and 87# pin of main relay are too large.
No Next step
Yes Next step
4 Start the engine, and check charging voltage of generator is between 9-16V within different speed range.
No Replace generator
Yes Diagnosis help
5 Check earth point of engine harness is good.
No Repair or replace harness
No.107 Malfunction code: P0563 "system voltage too high"
Serial No. Operation steps Results Follow-ups
1 Switch on diagnosis instrument and commutator, and place ignition switch to “OFF”. Next step
Yes Next step
2 Check battery voltage is around 12V with the multimeter.
Yes Next step 3 Start the engine, and check charging voltage of generator is between 9-16V within different speed range.
No Replace generator
Yes Diagnosis help
4 Check earth point of engine harness is good.
No Repair or replace harness