ELECTRICAL
10.9
Characteristic MIN TYP MAX UNIT Note
STARTER Output
Current 6 Amp Current capability of the STARTER output
TRANS
Park Voltage 118 490 870 mVdc Current capability of the output
Neutral Voltage 1.73 2.11 2.48 Vdc
BRAKE On
Input Voltage 2 14 16 Vdc Voltage on BRAKE input to activate the STARTER
output
REVERSE POLARITY PROTECTION
Battery Reverse Current 1.8 2 mA Max reverse leakage current when connected in
reverse
Reverse Bias Voltage -- 55 Vdc Absolute maximum reverse voltage before device
breakdown.
’HOT’ LIGHT OPERATION
With the ignition switch (and engine stop switch) “ON”,
power is delivered to the hot light via the Red/White
wire. The Blue/White wire (ground) out of the light
socket is connected to the PDM. If engine coolant
reaches the specified temperature, the thermistor
sends a power signal to the PDM, which completes
the ground path for the light. An open thermistor will
cause the engine hot indicator to light and cause the
fan motor to come on.
HOT LIGHT CIRCUIT TEST
1. Disconnect the thermistor.
2. Turn key and auxiliary switch to “ON” position.
The hot lamp (and fan) should come on. Check
the bulb and related wiring if the lamp does not
illuminate.
FANOPERATION/TESTING
Power to the fan is supplied via the PDM when the
ignition key and auxiliary shut--off switch are ON.
When the thermistor reaches the specified
resistance,thesignalis readby thePDM,whichturns
onpowertoOrange/Blkwire. Thegroundpathforthe
fan motor is through the Brown wire in the harness.
CAUTION: Keep hands away fromfanblades during
this procedure. Serious personal injury could result.
NOTE: The fan switch may not function or operation
may be delayed if coolant level is low or if air is trapped
inthe coolingsyste m. Be surecoolin gsystemis fu lland
purged of air . Refer to Maintenance Chapter 2.
FAN BYPASS TEST
1. Disconnect the harness from the thermistor .
2. Turn ignition key (and engine stop switch) “ON”.
The fan (and hot indicator) should turn on.
3. Ifthe fandoes notrunorruns slowlycheck thefan
motor wiring, ground, and motor condition (refer
to Fan Motor Testing this section). Repair or
replace as necessary.
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