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DTC P15A1

DTC P15A1

Diagnostic Instructions


Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provide an overview of each diagnostic category.


DTC Descriptor

DTC P15A1

Fuel Economy Mode Switch Performance

Diagnostic Fault Information

Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance
Fuel Economy Mode Switch 5 V Reference P159F P159F, P15A1 P159F P15A0 P15A1
Fuel Economy Mode Switch Signal P159F P159F P159F P15A0 P15A1
Fuel Economy Mode Switch Ground - P15A0, P15A1 P15A0 - P15A1


Circuit Description

The ECM supplies 5 V reference voltage, through the 5 V reference voltage circuit, to the S87 fuel economy mode switch. This reference voltage causes current to flow through a series of resistors in the switch to the ground circuit's switch. The ECM monitors the 5 V reference voltage through a discrete fuel economy mode switch signal circuit. When the switch button is momentarily pressed, the switch contacts allow the 5 V reference voltage signal to by-pass one of the resistors. The ECM detects the resulting voltage drop as a fuel economy mode request and sends a GMLAN message to the transmission control module (TCM) confirming the request. When the TCM receives the request, throttle progressions and transmission shift points are modified to optimize fuel efficiency. The instrument panel cluster (IPC) also receives the fuel economy mode request message from the ECM and illuminates the fuel economy mode indicator lamp. The fuel economy mode switch button must be pressed for between 0.094-1.5 s to activate the fuel economy mode.

Conditions for Running the DTC


The ignition key is turned to ON.

DTC P15A1 runs continuously when the above condition is met.


Conditions for Setting the DTC

The ECM detects that the voltage on the fuel economy mode switch signal wire is in an indeterminate range.

Action Taken When the DTC Sets

DTC P15A1 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P15A1 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))

Connector End View Reference

Component Connector End Views

Electrical Information Reference


Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Verify that DTCs P159F and P15A0 are not set.

2. If either or both of the DTCs are set, diagnose those DTCs first.

3. Ignition ON, verify the fuel economy mode indicator lamp on the instrument panel cluster is not illuminated.

4. Ignition ON, verify the fuel economy mode indicator lamp on the instrument panel cluster illuminates when the fuel economy mode switch button is pressed.

5. Engine on, check the DTC information with a scan tool. DTC P15A1 should not be set.

6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.


Circuit/System Testing

Note

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.



1. Ignition OFF, disconnect the harness connector at the S87 Fuel Economy Mode switch.

2.
Note

It may take up to 2 minutes for all vehicle systems to power down.


Ignition OFF, and all vehicle systems OFF, test for less than 5 Ω between ground circuit terminal 2 of the harness connector and ground.

3. If greater than the specified value, test the ground circuit for an open/high resistance and repair as necessary.

4. Test for 266-294 Ω between 5 V reference voltage circuit terminal 9 and signal circuit terminal 10 of the S87 fuel economy mode switch.

5. If not the specified range, replace the S87 fuel economy mode switch.

6. Test for 1,414-1,562 Ω between 5 V reference voltage circuit terminal 9 and ground circuit terminal 2 of the S87 fuel economy mode switch.

7. If not the specified range, replace the S87 fuel economy mode switch.

8. With the fuel economy mode switch button depressed, test for 486-538 Ω between 5 V reference voltage circuit terminal 9 and ground circuit terminal 2 of the S87 fuel economy mode switch.

9. If not the specified range, replace the S87 fuel economy mode switch.

10. Disconnect the X2 harness connector at the ECM.

11. Test for less than 5 Ω between 5 V reference voltage circuit terminal 14 of the ECM harness connector and 5 V reference voltage circuit terminal 9 of the fuel economy mode switch harness connector.

12. If greater than the specified value, repair the 5 V reference voltage circuit as necessary.

13. Test for less than 5 Ω between signal circuit terminal 29 of the ECM harness connector and signal circuit terminal 10 of the fuel economy mode switch harness connector.

14. If greater than the specified value, repair the signal circuit as necessary.

15. If all circuits test normal, replace the K20 ECM.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup and programming