12372-ZV4-010 Honda PLATE, VALVE (Honda Code 2944296).

Table 1
Diagnostic Trouble Codes for the Glow Plug Start Aid Relay Circuit
J1939 Code Description Notes
676-6 Engine Glow Plug Relay : Current Above Normal The Electronic Control Module (ECM) detects the following conditions:
The engine is not cranking.
The ECM has been powered for at least one second.
There is a high current condition (short circuit) in the glow plug start aid relay circuit for more than 2 seconds.
If equipped, the warning light will come on. The diagnostic code will be logged. An ECM that was previously blank will require a total of 2 hours of operation before the diagnostic code will be logged.
The ECM is unable to activate the relay for the glow plug starting aid. The glow plugs will not operate or the glow plugs will operate all the time. The engine may be difficult to start in cold temperatures and the exhaust may emit white smoke. The following background information is related to this procedure:The starting aid is used to improve the engine starting when the engine is cold. With the keyswitch in the ON position, the Electronic Control Module (ECM) will monitor the coolant temperature and the engine intake manifold air temperature in order to decide if the glow plugs need to be switched ON. If the glow plugs are required, then the ECM will activate the starting aid relay for a controlled period. While the glow plug start aid relay is activated, the glow plug start aid relay will supply power to the glow plugs. If a "Wait To Start" lamp is installed, then this lamp will be illuminated in order to indicate the "Wait To Start" period.The engine is equipped with ether injection. Glow plugs are used for temperatures that are between 5° C (41° F) and −25 °C (−13 °F). If the ambient temperature is below −25 °C (−13 °F), the glow plugs are disabled and ether injection is used."Wait to Start Lamp"This feature may be included as an option.When glow plugs need to be activated prior to starting, a lamp will indicate that the operator needs to "Wait to Start". Starting aids may be used during the cranking of the engine. Starting aids may be used if the engine has previously been started. The "Wait to Start" lamp will not be active in these conditions.Electronic Service Tool Test AidThe electronic service tool includes the test "Glow Plug Start Aid Override Test". This test will assist the analysis of the cold starting aid.Overview of the Glow Plug Start Aid Override Test This glow plug start aid override test switches on the cold starting aid when the engine is not running. The glow plug start aid override test aids the analysis of the circuit for the glow plug start aid relay.
Illustration 1 g02252573
Typical schematic for the glow plug starting aid circuit
Illustration 2 g02178340
View of the pin locations on the P1 connector for the glow plug starting aid circuit
(20) Glow plug start aid control
(59) Return Test Step 1. Inspect Electrical Connectors and Wiring
Check that the fuses are not blown.
Inspect the terminals on the glow plug start aid relay and then inspect the connector on the flying lead from the relay. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Inspect the bus bar for the glow plugs. Ensure that the nuts that secure the bus bar to each glow plug are tightened to a torque of 2 N m (17 lb in). Ensure that the bus bar is not shorted to the engine.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the glow plug starting aid.
Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).
Check the harness for abrasion and pinch points from the glow plugs back to the ECM. Results:
All connectors, pins, and sockets are correctly coupled and/or inserted. The harness is free of corrosion, abrasion, and pinch points. The fuses are not blown. The bus bar is secured to the glow plugs and not shorted to ground. - Proceed to Test Step 2.
There is a fault with the harness and connectors - Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are correctly connected. Replace blown fuses.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair has eliminated the fault.STOPTest Step 2. Check for Active Diagnostic Codes
Connect the electronic service tool to the diagnostic connector.
Turn the keyswitch to the ON position. Note: Do not start the engine.
Use the electronic service tool to select the "Glow Plug Start Aid Override Test" in order to turn on the power for the glow plugs.
Check for active diagnostic codes or recently logged diagnostic codes. Results:
Diagnostic code 676-6 is active or recently logged - Proceed to Test step 3.
An active diagnostic code or a recently logged diagnostic code was not displayed. - There may be a fault with the glow plug switched power circuit or there may be an open circuit in the relay coil circuit. The ECM does not monitor the status of these conditions. Proceed to Test Step 5.Test Step 3. Disconnect the Relay
Turn the keyswitch to the OFF position.
Disconnect the glow plug start aid relay.
Use the electronic service tool to select the "Glow Plug Start Aid Override Test" in order to turn on the power for the glow plugs.
Use the electronic service tool to check for an active 676-6 diagnostic code. Results:
A 676-6 diagnostic code is active at this time. - There is a short in the circuit for the relay coil. Reconnect the relay. Proceed to Test Step 4.
The 676-6 diagnostic code is not active with the relay disconnected. - There is a fault in the relay.Repair: Perform the following repair:
Install a replacement relay.
Use the electronic service tool to perform the "Glow Plug Start Aid Override Test".
Confirm that the fault has been eliminated. STOPTest Step 4. Disconnect the Relay at