Spectrum 3.0L GM - Page 112

112
DTC 106 MAP/Low/High/Short/Open
Step Action Value(s) Yes No
1
Did you perform the On-board diagnostics (OBD)
system check?
Go to Step (2)
Go to On-
Board Diag-
nostics
System
Check/Malfun
ction indicator
lamp.
2
 Key ON, engine off.
 Monitor the MAP reading.
Does the monitor display MAP reading of 508
kPa on the digital display?
508 kPa Go to Step (3)
Intermittent
problem. Go
to Preliminary
and Intermit-
tent Checks.
3
 Key OFF, disconnect C011 from the TMAP
sensor
 Key ON, measure the voltage across the
C011 connector, pins 1 and 3.
Is voltage between 4.8 and 5.2 volts?
Between
4.8 and
5.2V
Go to Step (4) Go to Step (5)
4
 Replace known good MAP sensor and retest.
 Is everything OK?
NOTE: Do not probe wires without proper ser-
vice tool. Permanent harness damage may
result.
Go to Step (7) Go to Step (5)
5
 Key OFF, disconnect ECU-B
 Check resistance between C011 pin 1 and
ECU-B pin H4, C011 pin 3 and ECU-B pin
H2, and C011 pin 4 and ECU-B pin H3.
Is resistance less than 5?
<5 Go to Step (6)
Repair open
in the wiring
and Go to
Step (7)
6
 Refer to diagnostics for 5 volt reference vol-
tage. See codes DTC 524260
 Retest for 5 volts at Co11 pins 1 and 3
Is voltage now between 4.8 and 5.2 volts?
Between
4.8 and
5.2V
Go to Step (7)
Replace the
ECU. Go to
Step (7)