• | 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 | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
Battery Supply Voltage - Coil | P1516, P1682, P2101 | P0685 | P1682, P1516, P2101 | -- | -- |
Battery Supply Voltage - Armature | -- | P1516, P1682, P2101 | P1516, P1682, P2101 | -- | -- |
Powertrain Relay Control Circuit | P0690 | P0685 | P1516, P1682, P2101 | P0685, P1516, P1682, P2101, P2176 | -- |
Ignition 1 Voltage Circuit | -- | P1516, P1682, P2101 | P1682, P1516, P2101 | -- | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: With the engine running, turn the ignition ON. Parameter Normal Range: 11.9-12.9V | |||
Battery Supply Voltage - Coil | 0 V | 0 V | -- |
Battery Supply Voltage - Armature | 0 V | 0 V | -- |
EC Ignition Relay Control | 0 V | 0 V | -- |
Engine Control Ignition Relay Feedback | 0 V | 0 V | More than 2 V¹ |
¹DTC P0690 will be set if the ECM detects voltage with the ignition OFF. |
The powertrain relay is a normally open relay. The relay switch is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the relay switch contact at all times. The Engine Control Module (ECM) supplies the ground path to the relay coil control circuit through an Output Driver Module (ODM). The ODM for the powertrain relay also incorporates a fault detection circuit, which is continuously monitored by the ECM. When the ECM commands the powertrain relay ON, ignition 1 voltage is supplied to fuses in the underhood fuse block.
The ignition 1 voltage that is supplied to the ECM, provides power to the internal ECM circuits associated with the Throttle Actuator Control (TAC) operation. The ECM also monitors the voltage level on the ignition 1 voltage circuit to confirm that the powertrain relay contacts have closed.
• | The battery voltage is between 9-18 volts. |
• | Ignition ON. |
• | The powertrain relay has been commanded ON. |
• | The battery voltage is within 9-16 volts. |
• | Ignition Off. |
• | The powertrain relay has been commanded OFF. |
• | The commanded state of the ODM does not match the actual state of the control circuit. |
• | It occurs 8 times during 10 tests. |
• | The ECM detects more than 2 volts on the ignition 1 voltage circuit to the ECM. |
• | This condition is present for more than 2 seconds. |
DTC P0685 and P0690 is a type B DTC.
DTC P0685 and P0690 is a type B DTC.
• | This test procedure assumes that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test. |
• | When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for correct tension. |
Diagnostic Trouble Code (DTC) Type Definitions
J 43244 Relay Puller Pliers
⇒ | The test lamp should illuminate on at least one test point of each fuse. If the test lamp does not illuminate continue with Circuit/System Testing. |
⇒ | If the voltage measures less than B+, repair the open or high resistance in the circuit to the relay coil. All wire circuit resistance should measure less than 2 ohms. |
⇒ | If voltage is measured on the control circuit of the relay, test for a short to voltage. |
⇒ | If the test lamp stays ON all the time, test for a short to ground on the powertrain relay control circuit or a faulty ECM. |
⇒ | All wire circuit resistance should measure less than 2 ohms. |
⇒ | All wire circuit resistance should measure less than 2 ohms. |
⇒ | If voltage is present, test the ignition 1 voltage circuit between the V8 ECM, the powertrain relay, and the V8 ECM fuse for a short to voltage. |
⇒ | If both circuits test normal, replace the ECM. |
⇒ | If the test lamp illuminates at both test points of the V8 ECM fuse, repair the ignition 1 voltage circuit between the V8 ECM fuse and the ECM for an open, high resistance, or a faulty ECM. All circuit resistance should be measured less than 2 ohms. |
⇒ | If the test lamp only illuminates at one test point of the V8 ECM fuse, repair the short to ground in the ignition 1 voltage circuit between the fuse and the applicable component. Replace the fuse as necessary. |
⇒ | If the test lamp does not illuminate on either test point of the V8 ECM fuse, repair the open or high resistance between the powertrain relay and the V8 ECM fuse. All wire circuit resistance should be measured 2 ohms or less. |
• | Measure for 70-110 ohms between terminals 85 and 86 of the relay. |
⇒ | If not within the specified range, replace the relay. |
• | Measure for infinite resistance between terminals 30 and 86 of the relay. |
⇒ | If continuity is detected, replace the relay. |
• | Measure for infinite resistance between terminals 30 and 87 of the relay. |
⇒ | If continuity is detected, replace the relay. |
• | Measure for infinite resistance between terminals 30 and 85 of the relay. |
⇒ | If continuity is detected, replace the relay. |
• | Measure for infinite resistance between terminals 85 and 87 of the relay. |
⇒ | If continuity is detected, replace the relay. |
• | Connect a 20-amp fused jumper wire between the battery positive cable and the relay terminal 85. Connect a jumper wire between the battery negative cable and the relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the resistance with a DMM. |
⇒ | If the resistance measures is more than 2 ohms, replace the relay. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.