• | 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 | Signal Performance |
---|---|---|---|---|
Accelerator Pedal Position (APP) Sensor 2 5-Volt Reference 1 Circuit | P0641, P0533, P0107, P0106, P0452 | P2127 | P0641, P0533, P0108, P0106 | -- |
Accelerator Pedal Position (APP) Sensor 1 5-Volt Reference 2 Circuit | P0651 | P2122 | P0651, P2135, P0335 | -- |
Air Conditioning (A/C) Refrigerant Pressure Sensor 5-Volt Reference 1 Circuit | P0641, P0532, P0452, P0107, P0106 | P0532 | P0641 | -- |
Engine Oil Pressure (EOP) Switch (if equipped) 5-Volt Reference 1 Circuit | P0107, P0641, P0522, P0452, P0532 | P0522 | P0641 | -- |
Fuel Tank Pressure (FTP) Sensor 5-Volt Reference 1 Circuit | P0641, P0532, P0452, P0107, P0106 | P0452 | P0641 | -- |
Manifold Absolute Pressure (MAP) Sensor 5-Volt Reference 1 Circuit | P0641, P0532, P0453, P0107, P0106 | P0107, P0106 | P0641 | -- |
Throttle Position (TP) Sensor 1 and 2 5-Volt Reference 2 Circuit | P0651, P0335 | P0222, P0122 | P0651 | -- |
Crankshaft Position (CKP) Sensor 5-Volt Reference 2 Circuit | P0651 | P0335 | P0651 | -- |
Camshaft Position (CMP) Sensor - Bank 1 Intake 5-Volt Reference 1 Circuit | P0641, P0532, P0452, P0107, P0106 | P0340, P0341 | P0641, P0533, P0108, P0106 | -- |
Camshaft Position (CMP) Sensor - Bank 1 Exhaust 5-Volt Reference 1 Circuit | P0641, P0532, P0452, P0107, P0106 | P0365 | P0641, P0533, P0108, P0106 | -- |
Camshaft Position (CMP) Sensor - Bank 2 Intake 5-Volt Reference 1 Circuit | P0641, P0532, P0452, P0107, P0106 | P0345 | P0641, P0533, P0108, P0106 | -- |
Camshaft Position (CMP) Sensor - Bank 2 Exhaust 5-Volt Reference 1 Circuit | P0641, P0532, P0452, P0107, P0106 | P0390 | P0641, P0533, P0108, P0106 | -- |
The control module 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 control module monitors the voltage on the 5-volt reference busses.
The 5-volt reference 1 bus provides 5 volts to the following sensors:
• | The manifold absolute pressure (MAP) sensor |
• | The fuel tank pressure (FTP) sensor |
• | The accelerator pedal position (APP) sensor 2 |
• | The air conditioning (A/C) refrigerant pressure sensor |
• | The engine oil pressure (EOP) sensor |
• | The camshaft position (CMP) sensor bank 1 intake |
• | The CMP sensor bank 1 exhaust |
• | The CMP sensor bank 2 intake |
• | The CMP sensor bank 2 exhaust |
The 5-volt reference 2 bus provides 5 volts to the following sensors:
• | The APP sensor 1 |
• | The crankshaft position (CKP) sensor |
• | The throttle position (TP) sensor 1 and 2 |
• | DTCs P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060D, P062F and P2610 are not set. |
• | The ignition is ON. |
• | The ignition voltage is more than 9.5 volts. |
• | DTCs P0641 and P0651 run continuously when the above conditions are met. |
The engine control module (ECM) detects a voltage out of tolerance condition on the 5-volt reference 1 or 2 bus for more than 0.5 second.
DTC P0641 and P0651 are Type A DTCs.
DTC P0641 and P0651 are Type A DTCs.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Observe the MAP sensor voltage parameter with a scan tool with the ignition ON and the engine OFF. The scan tool should displays 3.6-4.8 volts for a normally operating system.
With the ignition ON and the engine OFF, observe the APP sensor 1 voltage parameter with a scan tool. The scan tool should display 0.3-0.9 volt for a normally operating system.
Important:
• Additional DTCs will set when disconnecting the components. • A short to voltage on the signal circuit of certain components may cause this DTC to set.
⇒ | If the voltage is less than the specified value, test for a short to ground on all the 5-volt reference circuits. If all circuits test normal, replace the control module. |
⇒ | If the voltage is greater than the specified value, test for a short to voltage on all the 5-volt reference circuits, or the signal circuit, for each component associated with the appropriate 5-volt reference circuit. If all circuits test normal, replace the control module. |
⇒ | If the voltage display changes more than the specified value when a component is connected, replace the component. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.