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Illustration 1 g01044807
Schematic diagram of the diagnostic reset switchThe engine is not equipped with a remote control panel.
Illustration 2 g01044814
Schematic diagram of the diagnostic reset switchThe engine is equipped with a remote control panel that only includes a status control module.
Illustration 3 g01044815
Schematic diagram of the diagnostic reset switchThe engine is equipped with a remote control panel that includes a status control module and air/fuel ratio control.
Illustration 4 g01044816
Schematic diagram of the diagnostic reset switchThe engine is configured forCanadian Standards Association (CSA). The left schematic is for engines that are not equipped with the optional air/fuel ratio control.Test Step 1. Inspect the Electrical Components and the Wiring
Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Thoroughly inspect each of the following components:
EIS connectors
J1/P1 connectors for the ECM
The appropriate terminals on the terminal strips
The electrical connections for the diagnostic reset switch
The electrical connections for the idle/rated switch
The electrical connections for the oxygen calibration's switch
Illustration 5 g01044800
Harness side of the EIS connector (EISC-B) −Battery (EISC-h) Diagnostic reset
Illustration 6 g01044801
Harness side of the P1 connector (P1-3) Sensor ground (P1-37) Diagnostic reset
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the diagnostic reset.
Check the wiring for corrosion, for abrasion, and for pinch points.Expected Result:The components and the wiring are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The components are in good condition with proper connections. If you are troubleshooting a 321-04 diagnostic code, proceed to Test Step 2. If toggling the switch does not clear the codes, proceed to Test Step 5.
Not OK - The components are not in good condition and/or at least one connection is improper.Repair: Perform the necessary repairs and/or replace parts, if necessary.STOPTest Step 2. Determine the Engine's ConfigurationDetermine if the engine is equipped with the optional air/fuel ratio control.Expected Result:The engine is not equipped with the air/fuel ratio control.Results:
No - The engine is not equipped with the air/fuel ratio control. Proceed to Test Step 3.
Yes - The engine is equipped with the air/fuel ratio control. Proceed to Test Step 4.Test Step 3. Check for a Short Circuit
Disconnect the EIS connector.
Measure the resistance between the points that are listed in Table 2.
Table 1
Resistance Measurements for the Harness for the Diagnostic Reset Switch    
Terminals on the EIS Connector    
EISC-h (Input for the diagnostic reset)     EISC-B (−Battery)    
EISC-L (Ignition shutdown)
EISC-Y (Ground for the left detonation sensor)
EISC-Z (Ground for the speed/timing sensor)
EISC-c (Return for the ignition transformer for cylinder 13)
EISC-d (Ground for the right detonation sensor)
EISC-n (Return for the ignition transformer for cylinder 1)
EISC-p (Return for the ignition transformer for cylinder 3)
Shell for the EIS connector Expected Result:Each check of the resistance is greater than 5 Ohms.Results:
OK - Each check of the resistance is greater than 5 Ohms. The input for the diagnostic reset is not shorted to ground. Proceed to Test Step 9.
Not OK - At least one check of the resistance is less than 5 Ohms. There is a short circuit between ground and the input for the diagnostic reset.Repair: Repair the connection and/or the wire, when possible. Replace parts, if necessary. Verify that the problem is resolved.STOPTest Step 4. Check for a Short Circuit
Disconnect the P1 connector and the P2 connector.
Measure the resistance between the points that are listed in Table 2.
Table 2
Resistance Measurements for the Harness for the Diagnostic Reset Switch    
Terminals on the Connectors for the ECM    
P1-37 (Input for the diagnostic reset)     P1-3 (Sensor ground)    
P2-4 (−Battery)
P2-1 (Ground for the position sensor for the fuel actuator)
P2-6 (−Battery)