DTC P1289 [MZI-3.7 (PCM CONNECTOR (2 TYPES))]

id0102e3872700

DTC P1289

CHT sensor circuit high input

DETECTION CONDITION

•  Indicates a CHT sensor circuit open.

POSSIBLE CAUSE

•  Open circuit in wiring harness between CHT sensor terminal B and PCM terminal 2AL

•  Open circuit in wiring harness between CHT sensor terminal A and PCM terminal 2AN

•  Short to power supply in wiring harness between CHT sensor terminal A and PCM terminal 2AN

•  CHT sensor malfunction

•  Connector or terminal malfunction

DTC P1289	CHT sensor circuit high input
DETECTION CONDITION	• Indicates a CHT sensor circuit open.
POSSIBLE CAUSE	• Open circuit in wiring harness between CHT sensor terminal B and PCM terminal 2AL • Open circuit in wiring harness between CHT sensor terminal A and PCM terminal 2AN • Short to power supply in wiring harness between CHT sensor terminal A and PCM terminal 2AN • CHT sensor malfunction • Connector or terminal malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT POOR CONNECTION OF CHT SENSOR CONNECTOR • Turn the ignition switch off. • Disconnect CHT sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Are there any malfunction?	Yes	Repair or replace suspected part, then go to Step 8.
3		No	Go to the next step.
4	INSPECT CHT SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between CHT sensor terminal A (wiring harness-side) and body ground. • Is the voltage B+?	Yes	Repair or replace suspected part, then go to Step 8.
4		No	Go to the next step.
5	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/ pulled-out pins, corrosion). • Are there any malfunction?	Yes	Repair or replace suspected part, then go to Step 8.
5		No	Go to the next step.
6	INSPECT CHT SENSOR CIRCUIT FOR OPEN CIRCUIT • Inspect the continuity between the following circuit: ― CHT sensor terminal A (wiring harness-side) and PCM terminal 2AN (wiring harness-side). ― CHT sensor terminal B (wiring harness-side) and PCM terminal 2AL (wiring harness-side). • Are there continuity?	Yes	Go to the next step.
6		No	Repair or replace suspected part, then go to Step 8.
7	INSPECT CHT SENSOR • Inspect the CHT sensor. (See CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION [MZI-3.7].) • Is there any malfunction?	Yes	Replace the CHT sensor, then go to the next step.
7		No	Go to the next step.
8	VERIFY TROUBLESHOOTING OF DTC P1289 HAS BEEN COMPLETED • Verify that all disconnected connectors reconnected. • Clear the DTC from the PCM memory using the M-MDS. • Perform the KOEO or KOER self-test using the M-MDS. (See KOEO/KOER SELF TEST [MZI-3.7 (PCM CONNECTOR (2 TYPES))].) • Is the PENDING CODE for the DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZI-3.7].)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7 (PCM CONNECTOR (2 TYPES))].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7 (PCM CONNECTOR (2 TYPES))].)
9		No	Troubleshooting completed.