Service manual

G424F(FE) Service Manual Chapter 9. Advanced Diagnostics 265
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
disconnecting the TMAP connector and
measuring at the sensor:
TMAP Pin 1(GND) to Pin 4 (pressure
signal KPA) (2.4k - 8.2k )
TMAP Pin 3 (power) to Pin 4 (pressure
signal KPA) (3.4k - 8.2k )
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  - 8.2k )
TMAP Pin 3 (power) to Pin 4 (pressure
signal KPA) (3.4k  - 8.2k )
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.