CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM
56
DTC: P1651 Trouble light control circuit failure
No. Operating steps Result
Follow up
steps
1
Connect the diagnostic tester and commutator, put the
ignition switch to “ON”.
Next step
Yes Next step
2
Carry out action test to engine trouble light by using
diagnostic meter “actuator action test”item; and observe
the indicator if it is always at the status of extinguishing or
lighting on.
No
System is
correct
Yes
Repair or
replace cable
3
Check if there is open circuit or short circuit to ground of
the engine trouble light power supplying circuit.
No Next step
Yes
Repair or
replace cable
4
Check if there is open circuit or short circuit to power
supply or short circuit to ground between the circuit of
engine trouble light control ends and ECU pin No. 28.
No
Diagnosis
help
5. TYPICAL FAILURE AND ITS DIAGNOSIS FLOW
5.1 EXPLANATION
Carry out the primary inspection before start the diagnosing according to the engine failure
phenomenon.
1) Make sure the engine trouble light is working properly;
2) Make sure that there is no failure information record checked by diagnostic meter;
3) Make sure that the failure phenomenon exists according to the customers’complaints, and
confirm the conditions causing the failure.
Then carry out the exterior inspection:
（
1
）
Check if there is any fuel pipe is leaking;
（
2
）
Check if the vacuum pipe is broken, kinked up or linked correctly;
（
3
）
Check if the air intake pipe is jammed, leaking, staved or damaged;
（
4
）
Check the high voltage line of ignition system if it is broken or aging and if the
ignition order is correct;
（
5
）
Check the cable grounding place if it is clean and fastness;
