• | 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 provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
Accelerator Pedal Position (APP) Sensor 2 5-Volt Reference 1 Circuit | P0107, P0452, P0532, P0641, P1183, P2228 | P2127 | P0533, P0641, P2229, P2261 |
Accelerator Pedal Position (APP) Sensor 1 5-Volt Reference 2 Circuit | P0651 | P2122 | P0651 |
Air Conditioning (A/C) Refrigerant Pressure Sensor 5-Volt Reference 1 Circuit | P0069, P0107, P0340, P0345, P0365, P0390, P0452, P0522, P0532, P0641¹, P1183, P2228 | P0532 | P0533, P0641¹, P2229, P2261 |
Fuel Tank Pressure (FTP) Sensor 5-Volt Reference 1 Circuit | P0069, P0107, P0340, P0345, P0365, P0390, P0452, P0522, P0532, P0641, P1183, P2228 | P0452 | P0533, P0641¹, P2229, P2261 |
Manifold Absolute Pressure (MAP) Sensor 5-Volt Reference 1 Circuit | P0107, P0452, P0522, P0532, P0641, P1183, P2228 | P0107 | P0533, P0641¹, P2229, P2261 |
Throttle Position (TP) Sensor 1 and 2 5-Volt Reference 2 Circuit | P0651 | P0122, P0222 | P0651 |
Engine Oil Pressure (EOP) Sensor 5-Volt Reference 1 Circuit | P0069, P0107, P0340, P0345, P0365, P0390, P0452, P0522, P0532, P0641¹, P1183, P2228 | P0522 | P0533, P0641¹, P2229, P2261 |
Supercharger Intake Air Pressure (SIAP) 5-Volt Reference 1 Circuit | P0069, P0107, P0340, P0345, P0365, P0390, P0452, P0522, P0532, P0641, P1183, P2228 | P1183 | P0533, P0641¹, P2229, P2261 |
Crankshaft Position (CKP) Sensor 5-Volt Reference 2 Circuit | P0651 | P0335 | P0651 |
Camshaft Position (CMP) Sensor Bank 1 Exhaust 5-Volt Reference 1 Circuit | P0069, P0107, P0340, P0345, P0365, P0390, P0452, P0522, P0532, P0641, P1183, P2228 | P0365 | P0533, P0641¹, P2229, P2261 |
Camshaft Position (CMP) Sensor Bank 1 Intake 5-Volt Reference 1 Circuit | P0069, P0107, P0340, P0345, P0365, P0390, P0452, P0522, P0532, P0641, P1183, P2228 | P0340 | P0533, P0641¹, P2229, P2261 |
Camshaft Position (CMP) Sensor Bank 2 Exhaust 5-Volt Reference 1 Circuit | P0069, P0107, P0340, P0345, P0365, P0390, P0452, P0522, P0532, P0641, P1183, P2228 | P0390 | P0533, P0641¹, P2229, P2261 |
Camshaft Position (CMP) Sensor Bank 2 Intake 5-Volt Reference 1 Circuit | P0069, P0107, P0340, P0345, P0365, P0390, P0452, P0522, P0532, P0641, P1183, P2228 | P0345 | P0533, P0641¹, P2261, P2229 |
¹Engine crank but does not start |
The engine control module (ECM) has 2 internal 5-volt reference busses called 5-volt reference 1 and 5-volt reference 2. Each reference bus provides 5-volt reference circuits for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to that reference bus. The ECM monitors the voltage on the 5-volt reference busses.
The 5-volt reference 1 bus provides 5 volts to the following sensors:
• | The air conditioning (A/C) refrigerant pressure sensor |
• | The manifold absolute pressure (MAP) sensor |
• | The fuel tank pressure (FTP) sensor |
• | The accelerator pedal position (APP) sensor 2 |
• | The camshaft position (CMP) sensors |
• | The Engine Oil Pressure (EOP) sensor |
• | The Supercharger Intake Air Pressure (SIAP) sensor |
The 5-volt reference 2 bus provides 5 volts to the following sensors:
• | The APP sensor 1 |
• | The throttle position (TP) sensor 1 and 2 |
• | The crankshaft position (CKP) sensor |
• | DTCs P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, P1680 and P2610 are not set. |
• | The ignition is ON. |
• | The ignition voltage is more than 5.23 volts. |
• | DTCs P0641 and P0651 run continuously when the above conditions are met. |
The ECM detects a voltage out of tolerance condition on the 5-volt reference 1 or 2 bus for more than 0.5 second.
• | The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. |
• | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records. |
• | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
• | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
• | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
• | Clear the MIL and the DTC with a scan tool. |
Control Module References for scan tool information
Ignition ON, observe the scan tool 5-volt reference 1 and 2 parameters. The reading should display Circuit OK for a normally operating system.
Important: Additional DTCs may set when disconnecting components.
Important: A short to voltage on the signal circuit of certain components may cause this DTC to set.
⇒ | If less than the specified range, test all of the 5-volt reference circuits for a short to ground. If all circuits test normal, replace the ECM. |
⇒ | If greater than the specified range, test for a short to voltage on all of the 5-volt reference circuits or the signal circuit for each component associated with the appropriate 5-volt reference bus for a short to voltage. If all circuits test normal, replace the ECM. |
⇒ | If the voltage display changes more than the specified range when a component is connected, replace the component. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |