Jeep 1996 Grand Cherokee Service Manual - page 1441
MIL
CODE
*
GENERIC
SCAN
TOOL
CODE
HEX
CODE
DRB SCAN TOOL DISPLAY
DESCRIPTION OF DIAGNOSTIC
TROUBLE CODE
21**
P0131
9B
Upstream O2s Voltage Shorted
to Ground
Tested after key off and at start to run.
or
P0132
3E
Left O2 Sensor Shorted to
Voltage
Left oxygen sensor input voltage maintained
above the normal operating range.
or
P0133
66
Upstream O2 Sensor Slow
Response
Upstream oxygen sensor response slower
than minimum required switching frequency
or value does not go above .65 volts.
or
P0135
67
Upstream O2 Sensor Heater
Failure
Upstream oxygen sensor heating element
circuit malfunction
or
P0137
9C
Downstream O2s Voltage
Shorted to Ground
Tested after key off and at start to run.
or
P0138
7E
Downstream O2 Sensor
Shorted to Voltage
Downstream oxygen sensor input voltage
maintained above the normal operating
range.
or
P0141
69
Downstream O2 Sensor Heater
Failure
Downstream oxygen sensor heating element
circuit malfunction
22**
P0117
1E
ECT Sensor Voltage Too Low
Engine coolant temperature sensor input
below minimum acceptable voltage.
or
P0118
1F
ECT Sensor Voltage Too High
Engine coolant temperature sensor input
above maximum acceptable voltage.
23**
P0112
39
Intake Air Temp Sensor Voltage
Low
Intake air temperature sensor input below
the maximum acceptable voltage.
or
P0113
3A
Intake Air Temp Sensor Voltage
High
Intake air temperature sensor input above
the minimum acceptable voltage.
24**
P0121
84
TPS Voltage Does Not Agree
With MAP
TPS signal does not correlate to MAP
sensor
or
P0122
1A
Throttle Position Sensor Voltage
Low
Throttle position sensor input below the
minimum acceptable voltage
or
P0123
1B
Throttle Position Sensor Voltage
High
Throttle position sensor input above the
maximum acceptable voltage.
25**
P0505
19
Idle Air Control Motor Circuits
A shorted or open condition detected in one
or more of the idle air control motor circuits.
or
P1294
8A
Target Idle Not Reached
Actual idle speed does not equal target idle
speed.
27**
P0201
15
Injector #1 Control Circuit
Injector #1 output driver does not respond
properly to the control signal.
or
25 - 4
EMISSION CONTROL SYSTEMS
ZJ
DESCRIPTION AND OPERATION (Continued)