Jeep Cherokee 2000 Service Manual - page 1931
(M)
Malfunction Indicator Lamp (MIL) illuminated during engine operation if this DTC was
recorded (depending if required by CARB and/or EPA). MIL is displayed as an engine icon on
instrument panel.
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
Ambient/Batt Temp Sen Volts Too
High
External temperature sensor input above acceptable
voltage.
P1492 (M)
Ambient/Batt Temp Sensor Volts Too
High
Battery temperature sensor input voltage above an
acceptable range.
P1493 (M)
Ambient/Batt Temp Sen Volts Too
Low
External temperature sensor input below acceptable
voltage.
P1493 (M)
Ambient/Batt Temp Sen Volts Too
Low
Battery temperature sensor input voltage below an
acceptable range.
P1494 (M)
Leak Detection Pump Sw or
Mechanical Fault
Incorrect input state detected for the Leak Detection
Pump (LDP) pressure switch.
P1495
Leak Detection Pump Solenoid
Circuit
An open or shorted condition detected in the Leak
Detection Pump (LDP) solenoid circuit.
P1496
5 Volt Supply, Output Too Low
5 volt sensor feed is sensed to be below an acceptable
limit. ( less than 4v for 4 sec )
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.
P1594
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.
P1595
Speed Control Solenoid Circuits
An open or shorted condition detected in the speed
control vacuum or vent solenoid 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.
P1597
Speed Control Switch Always Low
Speed control switch input below the minimum acceptable
voltage.
P1598
A/C Pressure Sensor Volts Too High
A/C pressure sensor input above maximum acceptable
voltage.
P1598
A/C Sensor Input Hi
Problem detected in air conditioning electrical circuit.
P1599
A/C Pressure Sensor Volts Too Low
A/C pressure sensor input below minimum acceptable
voltage.
P1599
A/C Sensor Input Lo
Problem detected in air conditioning electrical circuit.
P1680
Clutch Released Switch Circuit
Problem detected in clutch switch electrical circuit.
P1681
No I/P Cluster CCD/J1850
Messages Received
No CCD/J1850 messages received from the cluster
control module.
XJ
EMISSION CONTROL SYSTEMS
25 - 13
DESCRIPTION AND OPERATION (Continued)