DTC P1460 [AJ (3.0L Duratec)]


DTC P1460	Wide open throttle A/C cutout primary circuit malfunction
DETECTION CONDITION	• The PCM monitors that the A/C compressor magnetic clutch control primary circuit voltage at PCM terminal 69 (R.H.D.) /C-25 (L.H.D.). If the PCM detects excessive current draw (while PCM grounds circuit) or no voltage (while PCM does not ground circuit), the PCM determines that the A/C relay control primary circuit failure.
POSSIBLE CAUSE	• Open circuit in wiring between A/C relay terminal 2and PCM terminal 69 (R.H.D.) /C-25 (L.H.D.) • Short to power circuit in wiring between A/C relay terminal 2 and PCM terminal 69 (R.H.D.) /C-25 (L.H.D.) • Short to GND circuit in wiring between A/C relay terminal 2 and PCM terminal 69 (R.H.D.) /C-25 (L.H.D.) • Damaged A/C relay • Open circuit in wiring between A/C relay terminal 1 and ignition switch • Damaged PCM


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 the FREEZE FRAME DATA on the repair order, then go to next step.
2	VERIFY REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to next step.
2		No	Go to the next step.
3	INDETIFY TRIGGER DTC FOR FEEZE FRAME DATA • Is DTC P1460 on FREEZE FRAME DATA?	Yes	Go to the next step.
3		No	Go to FREEZE FRAME DATA DTC inspection. (See DTC TABLE [AJ (3.0L Duratec)].)
4	INSPECT A/C CUTOUT PRIMARY CIRCUIT FOR INTERMITTENT FAILURE • Rerun KOEO, KOER self test and Continuous Memory DTCs. • Is DTC P1460 present in Continuous Memory self test only?	Yes	Go to Step 11.
4		No	Go to the next step.
5	VERIFY ACCS PID IS OFF Note • Verify A/C and defrost were off during KOEO/KOER self tests. If the vehicle is not equipped with A/C, the WOT A/C cut-off (WAC) circuit is not used and the DTC P1460 can be ignored. • Start the engine. • A/C and defroster off. • Access ACCS PID. • Is the ACCS PID off?	Yes	Go to the next step.
5		No	Inspect and repair for following: • A/C switch • Refrigerant pressure switch (low, middle and high pressure) • Wiring harness from refrigerant pressure switch (middle pressure) to PCM terminal 86 (R.H.D.) /C-26 (L.H.D.) • Wiring harness from refrigerant pressure switch (high pressure) to PCM terminal 41 (R.H.D.) /C-15 (L.H.D.) Then go to Step 13.
6	CHECK VPWR VOLTAGE TO A/C RELAY • Disconnect A/C relay. • Turn the ignition switch to ON. • Measure voltage at the A/C relay harness side connector terminal 69 (R.H.D.) /C-25 (L.H.D.). • Is voltage greater than 10.5 V?	Yes	Go to the next step.
6		No	Repair open circuit, then go to Step 13.
7	CHECK A/C RELAY • Refer to pin numbers molded on A/C relay. There will be either a Pin 1 or 85. • Measure resistance between either Pin 1 or Pin 85 and all other pins of the A/C relay. One measurement must be 40-120 ohms, with the other measurements being greater than 10,000 ohms. • Are all resistance checks okay?	Yes	Go to the next step.
7		No	Replace A/C relay, then go to Step 13.
8	CHECK WAC CIRCUIT FOR SHORT TO POWER IN HARNESS • Disconnect PCM. • Turn the ignition switch to ON. • Measure voltage between A/C relay terminal 2 at harness side connector and ground. • Is voltage less than 1.0 V?	Yes	Go to the next step.
8		No	Repair short to power, then go to Step 13.
9	CHECK WAC CIRCUIT FOR SHORT TO GROUND IN HARNESS • Disconnect WDS or equivalent from DLC. • Measure resistance between WAC circuit at A/C relay vehicle harness connector and ground. • Is the resistance greater than 10,000 ohm?	Yes	Go to the next step.
9		No	Repair short circuit, then go to Step 13.
10	CHECK WAC CIRCUIT FOR OPEN IN HARNESS • Measure resistance of WAC circuit between PCM terminal 69 (R.H.D.) /C-25 (L.H.D.) and A/C relay terminal 2 and at harness side connectors. • Is resistance less than 5.0 ohms?	Yes	Replace PCM, then go to Step 13.
10		No	Repair open circuit, then go to Step 13.
11	CHECK WAC CIRCUIT FOR INTERMITTENT SHORT TO GROUND • Turn the ignition switch to ON. • Check WAC circuit for short to GND while completing the following (the A/C clutch will click on when a fault is detected): - Shake, wiggle and bend the WAC circuit between PCM and A/C relay. - Lightly tap on the A/C relay (to simulate road shock). • Is fault indicated?	Yes	Isolate fault and repair intermittent fault, then go to Step 13.
11		No	Go to the next step.
12	CHECK WAC CIRCUIT FOR INTERMITTENT OPEN OR SHORT TO POWER • Turn the ignition switch to ON. • Access Output State Control Mode ACCS PID on the WDS or equivalent. • Turn on ACCS PID. • Check WAC circuit for open or short to power while completing the following (the A/C clutch will click off when a fault is detected): - Shake, wiggle and bend the WAC circuit between PCM and A/C relay. - Shake, wiggle and bend the VPWR circuit - Lightly tap on the A/C relay (to simulate road shock). • Is fault indicated?	Yes	Isolate fault and repair intermittent fault, then go to the next step.
12		No	Unable to duplicate or identify fault, go to the next step.
13	VERIFY TROUBLESHOOTING OF DTC P1460 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform KOEO/KOER self test. (See KOEO/KOER SELF-TEST [AJ (3.0L Duratec)].) • Is the PENDING CODE same DTC present?	Yes	Replace PCM, then go to next step. (See PCM REMOVAL/INSTALLATION [AJ (3.0L Duratec)].)
13		No	Go to the next step.
14	VERIFY AFTER SERVICE PRECAUTION • Perform "AFTER SERVICE PRECAUTION". (See AFTER SERVICE PRECAUTION [AJ (3.0L Duratec)].) • Is there any DTC present?	Yes	Go to applicable DTC inspection. (See DTC TABLE [AJ (3.0L Duratec)].)
14		No	Troubleshooting completed.