(Table 184, contd)
Troubleshooting Test Steps
Values Results
10. Check the Power Supply to the Relay Connector
A. Disconnect the connector for the glow plug relay.
B. Measure the voltage between Test Point A on the harness
connector for the relay and a suitable ground.
Refer to Illustration 113 and the appropriate Electrical
Schematic.
Battery voltage Result: There is no battery voltage at Test Point A on the
harness connector.
Repair: Check all wiring between the batteries and the glow
plug relay. Make any necessary repairs.
Result: Battery voltage is present at Test Point A on the
harness connector.
Proceed to Test Step 11.
11. Check the Power Supply to the Glow Plugs
A. Disconnect the power supply for the bus bar. Ensure that
the glow plug relay is connected.
B. Turn the keyswitch to the ON position.
C. Use the electronic service tool to select the “Glow Plug
Start Aid Override Test” to turn on the power for the glow
plugs.
D. Measure the voltage between the power supply wiring for
the bus bar and engine ground.
Battery voltage Result: There is no battery voltage at the power supply wir-
ing to the bus bar.
Repair: Check all wiring between the bus bar and the glow
plug relay. Make any necessary repairs.
If the wiring is OK, replace the glow plug relay.
Result: Battery voltage is present at the power supply wir-
ing to the bus bar.
The glow plug circuit appears to be operating correctly.
Return the engine to service.
i06165185
Idle Validation - Test
This procedure covers the following diagnostic
codes:
Table 185
Diagnostic Trouble Codes for the Idle Validation Switches
J1939 Code PDL Code
Code Description
Comments
558-2
91-0 Accelerator Pedal 1 Low Idle
Switch : Erratic, Intermittent, or
Incorrect
The Electronic Control Module (ECM) detects the following condition:
The signal from the Idle Validation Switch (IVS) is invalid.
If equipped, the warning light will come on. The ECM will log the diagnostic
code.
1634-2
2970-2
774-0 Accelerator Pedal 2 Low Idle
Switch : Erratic, Intermittent, or
Incorrect
1635-2
Follow the troubleshooting procedure in order to identify the root cause of the fault.
If the application is equipped with two throttles, the
engine will use the second throttle until the fault is
repaired.
If a second throttle is not installed or if the second
throttle has a fault, the following conditions will occur:
• The engine will default to limp home mode.
• If the engine speed is higher than the speed in
limp home mode, the engine will decelerate to limp
home mode.
• If the engine speed is lower than the speed in limp
home mode, the engine speed will remain at the
current speed.
334 UENR4469-36
Circuit Tests
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