ELECTRICAL
4222983 Second Edition 4-115
4
Overvoltage Limit Monitor (OLM) Diagnostic Trouble Codes (DTC)
DTC: OLM Warning 05
OLM internal temperature high.
DTC: OLM Warning 11
OLM detects a short circuit to ground in resistor 1.
DTC: OLM Warning 12
OLM detects no current through resistor 1.
DTC: OLM Warning 13
OLM detects less current than expected through resistor 1.
Probable Cause Remedy
Stuck throttle. Check throttle linkage; adjust and repair.
Faulty overvoltage limit monitor. Substitute the overvoltage limit monitor with a known good overvoltage limit monitor. If
system now works, re-install old component to verify fault returns.
Faulty throttle actuator. Test actuator. (See “Throttle Actuator Test (Diesel)” on page 4-134.) (See “Throttle
Actuator Test (Gas)” on page 4-135.)
Probable Cause Remedy
Moist debris between resistor and frame. Clear debris.
Ring terminal touching frame. Check ring terminal connection.
Faulty resistor. Measure resistance between the resistor terminals. Resistance must be approximately 2
ohms.
Faulty throttle actuator. Test actuator. (See “Throttle Actuator Test (Diesel)” on page 4-134.) (See “Throttle
Actuator Test (Gas)” on page 4-135.)
Probable Cause Remedy
Faulty connection. Check the resistor for loose terminals. Make sure the resistor terminals are clean and
tight.
Faulty resistor. Measure resistance between the resistor terminals. Resistance must be approximately 2
ohms.
Faulty overvoltage limit monitor. Substitute the overvoltage limit monitor with a known good overvoltage limit monitor. If
system now works, re-install old component to verify fault returns.
Probable Cause Remedy
Faulty connection. Check the resistor for loose terminals. Make sure the resistor terminals are clean and
tight.
Moist debris between resistor and frame. Clear debris.
Ring terminal touching frame. Check ring terminal connection.
Faulty resistor. Measure resistance between the resistor terminals. Resistance must be approximately 2
ohms.
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