Circuit Description
The powertrain ignition 1 relay is a normally open relay. The relay armature is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the armature contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver module (ODM). When the ECM commands the powertrain ignition 1 relay ON, ignition 1 voltage is supplied to the ECM through the ETC fuse in the underhood fuse block. This ignition 1 voltage input to the ECM provides the ignition power for the electronic throttle control (ETC) circuitry, and is also used to confirm the powertrain ignition 1 relay contacts have closed. This DTC will set when the ECM detects less than 10 volts on the ETC ignition 1 voltage circuit to the ECM, after the ignition switch is turned ON. DTC P0689 indicates an open, high resistance, or short to ground on the ETC ignition 1 voltage circuit to the ECM.
The underhood fuse block features an alphanumeric grid system for the terminals of the relays and the mini fuses. Along the top forward edge of the underhood fuse block, the letters A, B, C, D, E, F, G, H, J, K, L, and M are used. Along the top right edge of the underhood fuse block the numbers 1 through 20 are used. The powertrain ignition 1 relay circuits are assigned to the following cavities of the underhood fuse block.
| • | H13 - Battery positive voltage to the relay coil, hot at all times |
| • | H14 - Battery positive voltage to the relay armature, hot at all times |
| • | F14 - Relay coil control circuit, ECM controlled |
| • | F13 - Relay load circuit, ignition 1 voltage to the following fuses and relay |
| - | Fuel Fuse |
| - | O2 Sensor Fuse |
| - | ETC fuse |
| - | Emission Fuse |
| - | Even INJ Fuse |
| - | Odd INJ Fuse |
| - | A/C Comp Relay - Relay coil side |
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0689 Engine Controls Ignition Relay Feedback Circuit Low Voltage
Conditions for Running the DTC
| • | The battery voltage is between 9-16 volts. |
| • | The ignition switch is turned ON. |
| • | The powertrain ignition 1 relay has been commanded ON. |
Conditions for Setting the DTC
The ECM detects less than 10 volts on the ETC ignition 1 voltage circuit for more than 5 seconds.
Action Taken When the DTC Sets
| • | The control module stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will illuminate. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in Failure Records. |
| • | The driver information center, if equipped, may display a message. |
Conditions for Clearing the MIL/DTC
| • | A current DTC, last test failed clears when the diagnostic runs and passes. |
| • | A history DTC clears 40 consecutive warm-up cycles, if this or any other related diagnostic reports no other failures. |
| • | Clear the DTC with a scan tool. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views , Engine Controls Connector End Views , and Electrical Center Identification Views in Wiring Systems | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Did the DTC fail this ignition? | -- | Go to Step 3 | Go to Intermittent Conditions |
3 |
Does the test lamp illuminate on both test points of the ETC fuse? | -- | Go to Step 7 | Go to Step 4 |
4 | Does the test lamp illuminate on one test point of the ETC fuse? | -- | Go to Step 5 | Go to Step 9 |
5 |
Does the test lamp illuminate? | -- | Go to Step 19 | Go to Step 6 |
6 | Test the underhood fuse block bus bar circuit from the ETC fuse to the underhood fuse block electrical connector for a short to ground. Refer to Circuit Testing in Wiring Systems. Did you find a condition? | -- | Go to Step 21 | Go to Step 18 |
7 |
Does the resistance measure greater than the specified value? | 3 ohms | Go to Step 20 | Go to Step 8 |
8 | Test the underhood fuse block ignition 1 voltage bus bar circuit, from the ETC fuse to the underhood fuse block electrical connector for a high resistance or an open. Refer to Circuit Testing in Wiring Systems. Did you find a condition? | -- | Go to Step 21 | Go to Step 18 |
9 |
Notice: Refer to Test Probe Notice in the Preface section. Does the test lamp illuminate? | -- | Go to Step 10 | Go to Step 11 |
10 | Test the underhood fuse block ignition 1 voltage bus bar circuit, between the powertrain ignition 1 relay and the ETC fuse, for a high resistance or an open. Refer to Circuit Testing in Wiring Systems. Did you find and condition? | -- | Go to Step 21 | Go to Step 12 |
11 | Probe the mounting stud for the battery positive cable at the underhood fuse block, with a test lamp that is connected to a good ground. Does the test lamp illuminate? | -- | Go to Step 23 | Go to Starter Solenoid Does Not Click in Engine Electrical |
12 | Measure the resistance from terminal #85 of the powertrain ignition 1 relay to terminal #86 with a DMM. Refer to Troubleshooting with a Digital Multimeter in Wiring Systems. Does the resistance measure within the specified value? | 70-110 ohms | Go to Step 13 | Go to Step 22 |
13 | Measure the resistance from terminal #30 of the powertrain ignition 1 relay to terminal #387 with a DMM. Does the DMM display OL? | -- | Go to Step 14 | Go to Step 22 |
14 | Measure the resistance from terminal #30 of the powertrain ignition 1 relay to terminal #85 with a DMM. Refer to Troubleshooting with a Digital Multimeter in Wiring Systems. Does the DMM display OL? | -- | Go to Step 15 | Go to Step 22 |
15 | Measure the resistance from terminal #85 of the powertrain ignition 1 relay to terminal #87 with a DMM. Refer to Troubleshooting with a Digital Multimeter in Wiring Systems. Does the DMM display OL? | -- | Go to Step 16 | Go to Step 22 |
16 |
Does the resistance measure greater than the specified value? | 2 ohms | Go to Step 22 | Go to Step 17 |
17 | Test for an intermittent and for a poor connection at the powertrain ignition 1 relay terminals, F13 and H14, on the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you find a condition? | -- | Go to Step 21 | Refer to Intermittent Conditions |
18 | Test for shorted terminals and poor connections at the ECM electrical connector and the ECM wire harness electrical connector. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 24 | Go to Step 23 |
19 | Repair the short to ground in the ignition 1 voltage circuit, between the underhood fuse block wire harness electrical connector and the ECM wire harness electrical connector. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 24 | -- |
20 | Repair the high resistance or an open in the ignition 1 voltage circuit, between the underhood fuse block wire harness electrical connector and the ECM wire harness electrical connector. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 24 | -- |
21 | Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems. Did you complete the replacement? | -- | Go to Step 24 | -- |
22 | Replace the powertrain ignition 1 relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | -- | Go to Step 24 | -- |
23 | Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 24 | -- |
24 |
Did the DTC fail this ignition? | -- | Go to Step 3 | Go to Step 25 |
25 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |
