KQ: Thermostat Heater Control (THTRC)

KQ: Introduction See: KQ: Thermostat Heater Control (THTRC) - Introduction

KQ10 DTC P1432: CHECK VPWR AT THTRC HARNESS CONNECTOR

Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.

• Disconnect the thermostat harness connector.
• Key on.
• Measure VPWR circuit voltage at THTRC harness connector.

Is the voltage reading greater than 10.5 volts?
Yes

• KEY OFF. GO to KQ11

.

No

• KEY OFF. REPAIR VPWR circuit.

KQ11 CHECK THERMOSTAT RESISTANCE

• Measure resistance of the thermostat at the two pin terminal connector.

Is resistance between 14.0 and 16.0 ohms?
Yes

• GO to KQ12

.

No

• REPLACE thermostat.

KQ12 CHECK THTRC CIRCUIT FOR OPEN IN HARNESS

• Disconnect PCM.
• Measure resistance between THTRC circuit between PCM harness connector pin and the THTRC harness connector.

Is the resistance less than 5.0 ohms?
Yes

• GO to KQ13

.

No

• REPAIR open circuit.

KQ13 CHECK THTRC CIRCUIT FOR SHORT TO GROUND OR VPWR IN HARNESS

• Measure resistance between THTRC PCM pin and PCM pins VPWR, SIG RTN and PWR GND.

Is each resistance greater than 10,000 ohms?
Yes

• For Continuous DTC P1432 only,

GO to Z1 See: Diagnostic Trouble Code Tests and Associated Procedures\SECTION 5: Pinpoint Tests\Z: Intermittent - Pinpoint Test
.

• For KOEO or KOER DTC P1432,

REPLACE PCM.

No

• REPAIR short to GND or VPWR.