W/Harness Inspection

Engine Control
P2147 Fuel Injector Group \'A\' Supply Voltage Circuit Low - Inspection/Repair:_:W/Harness Inspection

Power Circuit Inspection

1. IG OFF.
2. Backprope both terminals of the injector connector.
3. Engine RUNNING.
4. Measure the signal waveform of the injector.





GDI Injector driver circuit








(1) - Normal signal at the HIGHSIDE terminal(HS_14)
- Power supply to No.1 & No.4 injectors
(2) - Normal signal at the LOWSIDE terminal(LS_1)
- No.1 injector working
(3) - Normal signal at the LOWSIDE terminal(LS_4)
- No.4 injector not working
A. Normal operating signal of ECU HS_14, LS_1 and LS_4 during No.1 Cyl. Injection
** ECM's HIGHSIDE control circuit(HS_14) is connected to No.1 and No.4 injectors together and ECM's HIGHSIDE control circuit(HS_23) is connected to No.2 and No.3 injectors together.

Signal Circuit Inspection

Check for Short to Ground in Control harness
1. IG OFF.
2. Disconnect the Injector and PCM connectors.
3. Measure the resistance between the Highside terminal of Injector harness connector and chassis ground.

Specification :Infinite




4. Is the measured resistance within specifications?





Check for Open in Control harness
1. IG OFF.
2. Disconnect the Injector and PCM connectors.
3. Measure the resistance between both ends of the Highside control harness.

Specification :Approx. 0Ohms




4. Is the measured resistance within specifications?






Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?