GROVE Published 10-21-2010, Control# 198-04 6-17
5540F/YB5515 SERVICE MANUAL ENGINE AND ENGINE SYSTEMS
NOTE: For electrical connections, pin numbers, etc., refer to wiring diagrams.
Error Code Diagnostics
Code 12: Code 12 is special code signifying the beginning or end of the error codes.
Code 13: Code 13 indicates the oxygen (O2) sensor has not warmed up or is stuck rich, lean or neutral for a period of time.
Other fuel system issues can cause this; for example, incorrect fuel pressure, or a leak in the MAP sensor hose.
To verify the oxygen sensor wiring:
1. Verify fuses are intact.
2. Disconnect the oxygen sensor connector, and turn the ignition power on.
3. Measure the voltage across the oxygen harness connector pins A (-) and B (+). This should read near
0.45 volts.
4. If not turn off the power.
5. Disconnect the ECM.
6. Check the connections shown below:
7. Turn on the ignition
7.1 Measure the voltage across the harness oxygen sensor connector pins C (+) and D (-). This should
read near battery voltage. If not perform the following measurements:
7.2 If battery voltage is present in step 7.1, measure resistance between the 2 white wires on the O2 sen-
sor. There should be between 1.5 to 3.52 ohms at room temperature. If the heater is open or shorted,
replace the sensor. A warm sensor will read higher resistance than a cold sensor. If no wires are open
or shorted. Verify the rest of the fueling system is operating properly. If everything else checks out,
replace the oxygen sensor.
Code 14: The engine coolant reads too high. It is possible to receive this code if the engine is severely overheated above
280° F (138° C).
Harness O2 Sensor Check
Meter Mode From To
Desired
Result
If Defective
Ohms ECM10 Harness O2 A <1 Ohm Wire is open
Ohms ECM10 Harness O2 B Open Wire is shorted
Ohms ECM20 Harness O2 A < 1 Ohm This wire is open
Ohms ECM 20 Harness O2 B Open Wire is shorted
Harness O2 Heater Check
Meter Mode From To
Desired
Result
If Defective
Voltage Ground Harness O2 C 10 - 14 volts O2 wire is open
Voltage Battery + Harness O2 C < 1 volt O2 wire is open
Voltage Ground Harness O2 C < 1 volt O2 wire is open
Voltage Battery + Harness O2 C 10 - 14 volts O2 wire is open
Reference Only
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