Operation Section
68
Table 2. Diagnostic Fault Codes (Flash Codes) cont’d.
DFC
PROBABLE FAULT
FAULT ACTION *
CORRECTIVE ACTION FIRST CHECK
341
(34)
MAPTimeRangeHigh
Manifold Absolute Pressure
Sensor Input is High, normally
set if the TMAP pressure
signal wire has become
shorted to power, shorted to
the IAT signal, the TMAP has
failed or the SECM has failed.
None
Check TMAP connector and MAP signal wiring
for a shorted circuit
TMAP Pin 4 to SECM Pin B18 (signal)
TMAP Pin 1 to SECM Pin B1 (sensor GND)
TMAP Pin 3 to SECM Pin B24 (XDRP +5 Vdc)
Check the MAP sensor by disconnect-ing the
TMAP connector and measuring at the sensor:
TMAP Pin 1(GND) to
Pin 4 (pressure signal KPA) (2.4k
Ω
- 8.2k
Ω
)
TMAP Pin 3 (power) to
Pin 4 (pressure signal KPA) (3.4k
Ω
- 8.2k
Ω
)
342
MAPRangeHigh
Manifold Absolute Pressure
Sensor Input is High, normally
set if the TMAP pressure
signal wire has become
shorted to power, shorted to
the IAT signal, the TMAP has
failed or the SECM has failed
(1) TurnOnMil
(2) CutThrottle
Check TMAP connector and MAP signal wiring
for a shorted circuit
TMAP Pin 4 to SECM Pin B18 (signal)
TMAP Pin 1 to SECM Pin B1 (sensor GND)
TMAP Pin 3 to SECM Pin B24 (XDRP +5 Vdc)
Check the MAP sensor by disconnecting the
TMAP connector and measuring at the sensor:
TMAP Pin 1(GND) to
Pin 4 (pressure signal KPA) (2.4k
Ω
- 8.2k
Ω
)
TMAP Pin 3 (power) to
Pin 4 (pressure signal KPA) (3.4k
Ω
- 8.2k
Ω
)
351
MAP_IR_HI
MAP sensor indicates higher
pressure than expected
None
Check for vacuum leaks. Check that TMAP
sensor is mounted properly. Possible defective
TMAP sensor.
352
MAP_IR_LO
MAP sensor indicates lower
pressure than expected
None
Possible defective TMAP sensor.
353
MAP_STICKING
MAP sensor not changing as
expected
None
Check that TMAP sensor is mounted properly.
Possible defective TMAP sensor.
371
(37)
IATRangeLow
Intake Air Temperature
Sensor Input is Low normally
set if the IAT temperature
sensor wire has shorted to
chassis ground or the sensor
has failed.
TurnOnMil
Check TMAP connector and IAT signal wiring
for a shorted circuit
TMAP Pin 2 to SECM Pin B12 (signal)
TMAP Pin 1 to SECM Pin B1 (sensor GND)
To check the IAT sensor of the TMAP
disconnect the TMAP connector and measure
the IAT resistance
Resistance is approx 2400 ohms at room
temperature.
(*) Fault actions shown are default values specified by the OEM.
