P1115-GENERAL TEMPERATURE RATIONALITY

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on and battery voltage greater than 10 volts.
Set Condition:
AAT, ECT, and IAT sensor inputs are compared during a cold start. After start up, the values are monitored. If one of the readings is not plausible for two consecutive trips, a DTC is stored. Three good trips turns off the MIL.

Possible Causes

SENSOR SIGNAL CIRCUIT HIGH RESISTANCE

SENSOR GROUND CIRCUIT HIGH RESISTANCE

TEMPERATURE SENSOR

POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Diagnostic Test

1.ACTIVE DTC

NOTE: Diagnose and repair any AAT, ECT, and IAT sensor DTCs before continuing with this test.

NOTE: Diagnose and repair P1607 PCM INTERNAL SHUTDOWN TIMER SLOW RATIONALITY or P2610 PCM INTERNAL SHUTDOWN TIMER FAST RATIONALITY if either code is set before continuing with this test.

NOTE: Using an unapproved block heater in cold temperatures may cause this DTC to set. No repair is required.

Is the status Active for this DTC?

Yes

Go to 2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.TEMPERATURE SENSOR CIRCUIT VALUE IMPLAUSIBLE

NOTE: Allow the engine sit for 6 - 8 hours before testing.

Does the value for each of the sensors increase smoothly and as expected?

Yes

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go to 3

3.TEMPERATURE SENSOR

NOTE: If it is necessary to replace the AAT sensor, be sure to drive the vehicle over 30 MPH for at least 5 minutes to update the AAT value.

NOTE: The sensor voltage should be approximately 5.0 volts with the connector disconnected.

NOTE: The sensor voltage should be approximately 0 volts with the jumper wire in place.

Does the sensor voltage change as described?

Yes

Replace the sensor.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to 4

4.SENSOR SIGNAL CIRCUIT HIGH RESISTANCE

Is the resistance above 5.0 ohms.

Yes

Repair the sensor signal circuit for high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to 5

5.SENSOR GROUND CIRCUIT HIGH RESISTANCE

Is the resistance above 5.0 ohms.

Yes

Repair the sensor ground circuit for high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to 6

6.POWERTRAIN CONTROL MODULE (PCM)

Were any problems found?

Yes

Repair as necessary.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Replace and program the Powertrain Control Module per Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).