(M) Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was
recorded.
(G) Generator Lamp Illuminated
GENERIC
SCAN TOOL
CODE
DRB SCAN TOOL DISPLAY DESCRIPTION OF DIAGNOSTIC TROUBLE CODE
P1490 (M) Low Speed Fan CTRL Relay Circuit An open or shorted condition detected in control circuit of
the low speed radiator fan control relay.
P1491 Rad Fan Control Relay Circuit An open or shorted condition detected in the radiator fan
control relay control circuit. This includes PWM solid state
relays.
P1492 (M,G) Ambient/Batt Temp Sen Volts Too
High
External temperature sensor input above acceptable
voltage.
P1493 (M,G) Ambient/Batt Temp Sen Volts Too
Low
External temperature sensor input below acceptable
voltage.
P1494 (M) Leak Detection Pump Sw or
Mechanical Fault
Incorrect input state detected for the Leak Detection
Pump (LDP) pressure switch.
P1495 (M) Leak Detection Pump Solenoid
Circuit
An open or shorted condition detected in the Leak
Detection Pump (LDP) solenoid circuit.
P1496 (M) 5 Volt Supply, Output Too Low 5 volt sensor feed is sensed to be below an acceptable
limit.(<4vfor4sec).
P1498 High Speed Rad Fan Ground CTRL
Rly Circuit
An open or shorted condition detected in the control
circuit of the #3 high speed radiator fan control relay.
P1594 (G) Charging System Voltage Too High Battery voltage sense input above target charging voltage
during engine operation.
P1595 Speed Control Solenoid Circuits An open or shorted condition detected in either of the
speed control vacuum or vent solenoid control circuits.
P1596 Speed Control Switch Always High Speed control switch input above maximum acceptable
voltage.
P1597 Speed Control Switch Always Low Speed control switch input below minimum acceptable
voltage.
P1598 A/C Pressure Sensor Volts Too High A/C pressure sensor input above maximum acceptable
voltage.
P1599 A/C Pressure Sensor Volts Too Low A/C pressure sensor input below minimum acceptable
voltage.
P1680 Clutch Released Switch Circuit
P1681 No I/P Cluster CCD/J1850
Messages Received
No CCD/J1850 messages received from the cluster
control module.
P1682 (G) Charging System Voltage Too Low Battery voltage sense input below target charging voltage
during engine operation and no significant change in
voltage detected during active test of generator output
circuit.
P1683 SPD CTRL PWR Relay; or S/C 12v
Driver CKT
An open or shorted condition detected in the speed
control servo power control circuit. (SBECII: ext relay).
P1684 The battery has been disconnected within the last 50
starts.
P1685 Skim Invalid Key The engine controler has received an invalid key from the
SKIM.
25 - 10 EMISSION CONTROL SYSTEMS LH
DESCRIPTION AND OPERATION (Continued)
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