DTC P1475: AUXILIARY 5 VOLT OUTPUT TOO HIGH

Monitor & Set Conditions

Auxiliary 5-volt output circuit is monitored with ignition on engine off, and with engine running. DTC may set if voltage on 5-volt sensor supply circuit exceeds 5.7 volts for 5 seconds.

Possible Causes

• 5-volt Supply Circuit Shorted To Battery Voltage
• Wiring Harness Or Connector
• Broken, Bent Or Pushed Out Terminals
• ECM

Testing

1. Turn ignition on with engine off. Using DRBIII(R) scan tool, check for DTCs. If Good Trip Counter for DTC P1475 is displayed and not equal to zero, go to next step. If Good Trip Counter for DTC P1475 is displayed and equal to zero, go to step 3 .

2. Ensure ignition is on with engine off. At this time, DTC is intermittent. Using scan tool, determine if DTC matches FREEZE FRAME DTC. If DTC is not equal to FREEZE FRAME DTC, freeze frame DTC is a higher priority DTC and should be diagnosed before diagnosing DTC P1475. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If DTC is equal to FREEZE FRAME DTC, try to duplicate conditions recorded in FREEZE FRAME data. Start engine and allow engine to idle. Using scan tool in SENSORS, read Manifold Absolute Pressure (MAP) sensor voltage. If MAP sensor voltage is greater than 5.2 volts, go to next step. If MAP sensor voltage is 5.2 volts or less, go to step 4 .

3. Turn engine off. Disconnect MAP sensor harness connector. MAP sensor is located on driver's side rear corner of cylinder head. Check for poor connection/terminal contact at MAP sensor harness connector. Repair as necessary. Start engine and allow engine to idle. Using DVOM, measure voltage between ground and terminal No. 1 (Orange wire) on MAP sensor harness connector. If voltage is 5.2 volts or less, replace and program ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. If voltage is greater than 5.2 volts, repair short to voltage on Orange wire between MAP sensor and ECM. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector.

4. Shut engine off. Turn ignition on with engine off. Using scan tool, monitor MAP sensor voltage while wiggling wiring harness and connectors between MAP sensor and ECM. MAP sensor is located on driver's side rear corner of cylinder head. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. If MAP sensor voltage does not change while wiggling wiring harness and connectors, go to next step. If MAP sensor voltage changes while wiggling harness and/or connectors, repair wiring or connectors as necessary.

5. Problem is intermittent. Inspect MAP sensor harness connector and ECM harness connector for corroded, pushed out or damaged terminals. Inspect wiring harness and connectors between MAP sensor and ECM for chafed, pierced or partially broken wires. If terminals are not corroded, pushed out or damaged and wiring is okay, check for technical service bulletins that may apply. If terminals are corroded, pushed out or damaged, or wiring is damaged, repair as necessary.