PURPOSE
On some affected vehicles, the powertrain control module (PCM) may cause the "SERVICE ENGINE SOON" light to come on. Diagnostic
Trouble Code DTC P0120 "Throttle Position Circuit Malfunction" may also set in the PCM.
If the PCM has previously been reprogrammed for this condition or if the vehicle was originally equipped with the latest PCM programming,
perform the diagnosis instructions in Group 13 of the appropriate service manual for DTC P0120. If the PCM has not been previously
reprogrammed and the TPS operates normally, replace the PCM.
AFFECTED VEHICLES
1999 Montero Sport 2.4L models produced before 9/10/98
1999 Montero Sport 3.0L manual transmission models produced before 8/29/98
1999 3000GT SOHC and DOHC models produced before 8/25/98
1999 3000GT DOHC turbocharged (VR-4) models produced before 8/9/98
1999 Montero models produced before 8/25/98
> IMPORTANT: This bulletin does NOT apply to 1.5L and 1.8L Mirage models. Refer to TSB-99-13-007 for PCM reprogramming
instructions for these models.
NOTE: This bulletin does not apply to 1999 Galant and Eclipse. Refer to TSB-98-13-013REV for these models.
PROCEDURE
1.Using the MUT-
II
scan tool, check to see if any DTCs are set in the PCM. If
any DTC except DTC P0120
is set, follow the appropriate
troubleshooting and repair instructions in the service manual. Then go to Step 2.
2.Inspect the underhood of the vehicle for an Engine Compartment label.
a.If there is a label indicating that this TSB has already been completed, refer to the diagnosis instructions for DTC P0120 in Group 13 of the
appropriate service manual. Do not continue with this procedure.
b.If there is not a label indicating that this TSB has already been completed, verify the PCM software level by either checking the vendor
number on the PCM label, or by checking the ROM ID with the MUT-
II
scan tool.
(1)If checking on the PCM label: If the vendor number is lower than the vendor number in the chart in the PARTS INFORMATION section of
this bulletin, continue with Step 3.
(2)If checking with the MUT-
II
scan tool: Connect the scan tool to the vehicle and perform the following selection sequence:
SUBJECT :
DTC P0120 DIAGNOSIS
No:
TSB-99-13-008
DATE:
October, 1999
MODEL:
See below
CIRCULATE TO
:
[ ] GENERAL MANAGER
[X]
PARTS MANAGER
[
X
] TECHNICIAN
[
X
] SERVICE ADVISOR
[
X
] SERVICE MANAGER
[
X
] WARRANTY PROCESSOR
[ ] SALES MANAGER
