Mitsubishi Montero (1998+). Manual — part 188
wiring harness as necessary. If continuity exists, go to next step.
5) Reconnect PCM connector. Turn ignition switch to ON
position. Check voltage between chassis ground and ECT sensor
connector terminal No. 1. If voltage is not 4.5-4.9 volts, replace
PCM. If voltage is as specified, condition required to set DTC is not
present at this time. Go to next step.
6) Test is complete. Intermittent problem may exist. Road
test vehicle (if necessary) and attempt to duplicate conditions that
caused original complaint. Recheck for DTCs. If no DTCs are displayed,
go to INTERMITTENT DTCS.
DTC P0120: THROTTLE POSITION (TP) SENSOR CIRCUIT FAILURE
NOTE: For terminal identification, see TERMINAL IDENTIFICATION. For
circuit and wire color identification, see
L - WIRING DIAGRAMS article.
1) If using scan tool, go to step 3). Disconnect TP sensor
connector. Using DVOM, check resistance between TP sensor terminals
No. 1 and No. 4. If resistance is not 3500-6500 ohms, replace TP
sensor. If resistance is as specified, go to next step.
2) Check resistance between TP sensor terminals No. 1 and 3
on Montero or No. 2 and 4 on 3000GT. While monitoring DVOM, slowly
open throttle from idle to fully open position. If resistance does not
change smoothly, replace TP sensor. If resistance changes smoothly, go
to step 4).
3) Turn ignition switch to ON position. Using scan tool, read
TP sensor voltage value (item 14). With throttle at idle, value should
read 300-1000 mV. Value should increase while slowly opening throttle.
At wide open throttle, value should read 4500-5500 mV. If value is not
as specified, replace TP sensor. If value is as specified, go to next
step.
4) Disconnect TP sensor connector. Using DVOM, check
continuity between chassis ground and TP sensor connector terminal No.
1. If continuity does not exist, repair wiring harness as necessary.
If continuity exists on 3000GT, go to next step. On Montero, go to
step 6).
5) Check continuity between chassis ground and TP sensor
connector terminal No. 4. If continuity does not exist, repair wiring
harness as necessary. If continuity exists, go to next step.
6) Turn ignition switch to OFF position. Disconnect PCM
connector. Ground specified PCM connector terminal. See
TP SENSOR-TO-PCM WIRING HARNESS TERMINAL IDENTIFICATION table. Check
for continuity between chassis ground and specified TP sensor
connector terminal. If continuity does not exist, repair wiring
harness as necessary. If continuity exists on 3000GT, go to step 8).
On Montero, go to next step.
TP SENSOR-TO-PCM WIRING HARNESS TERMINAL IDENTIFICATION TABLE
Application TP Sensor Terminal No. PCM Terminal No.
Montero . . . . . 3 . . . . . . . 78
4 . . . . . . . 42
3000GT . . . . .. 2 . . . . . . . 78
7) Reconnect PCM connector. Turn ignition switch to ON
position. Check voltage between chassis ground and TP sensor connector
terminal No. 4 on Montero or No. 1 on 3000GT. If voltage is not 4.8-5.
2 volts, replace PCM. If voltage is as specified, condition required
to set DTC is not present at this time. Go to next step.
8) Test is complete. Intermittent problem may exist. Road
test vehicle (if necessary) and attempt to duplicate conditions that
caused original complaint. Recheck for DTCs. If no DTCs are displayed,
go to INTERMITTENT DTCS.
DTC P0125: EXCESSIVE TIME TO ENTER CLOSED LOOP FUEL CONTROL
NOTE: For terminal identification, see TERMINAL IDENTIFICATION. For
circuit and wire color identification, see
L - WIRING DIAGRAMS article.
Specific self-diagnostic test not available from manufacturer
at time of publication. Check front heated oxygen sensor, fuel
injectors, and related connectors and harnesses. Also, see F - BASIC
TESTING article.
DTC P0130, P0135, P0150 & P0155: FRONT HEATED OXYGEN SENSOR
(HO2S) CIRCUIT FAILURE
NOTE: For terminal identification, see TERMINAL IDENTIFICATION. For
circuit and wire color identification, see
L - WIRING DIAGRAMS article.
1) If using scan tool, go to step 3). Disconnect front HO2S
connector. Install Test Harness (MB998464) between HO2S and HO2S
connector. Using DVOM, check resistance between specified HO2S
connector heater terminals. See
FRONT HO2S CONNECTOR TERMINAL IDENTIFICATION table. HO2S resistance
should be 11-18 ohms at 68
F (20
C). If resistance is not as
specified, replace HO2S. If resistance is as specified, go to next
step.
2) Start and warm engine to operating temperature. Using
jumper wires, apply 12 volts and ground to specified HO2S connector
heater terminals. See FRONT HO2S CONNECTOR TERMINAL IDENTIFICATION
table. Using DVOM, check voltage between specified HO2S connector
output terminals, while repeatedly racing engine. If voltage is not .
6-1.0 volt, replace HO2S. If voltage is .6-1.0 volt, go to step 5).
FRONT HO2S CONNECTOR TERMINAL IDENTIFICATION TABLE
Application (1) Heater Terminals No. Output Terminals No.
Montero & 3000GT . . . 1 & 3 . . . . . . ... 2 & 4
(1) - First terminal listed is positive. Second terminal listed is
negative.
3) Start and warm engine to operating temperature. Using scan
tool, read HO2S voltage. See HO2S ITEM LIST IDENTIFICATION table for
appropriate scan tool item number. While monitoring scan tool,
accelerate to 4000 RPM. Suddenly decelerate. Scan tool should read 0.2
volt or less. Suddenly accelerate. Scan tool should read 0.6-1.0 volt.
If voltage is not as specified, replace HO2S. If voltage is as
specified, go to next step.
HO2S ITEM LIST IDENTIFICATION TABLE
Application Item No.
Montero - Federal
Front . . . . . . . . . . . . . . . 11
Rear . . . . . . . . . . . . . . .. 59
Except Montero - Federal
Front
Left . . . . . . . . . . . . . . 39
Right . . . . . . . . . . . . . ... 11
Rear
Left . . . . . . . . . . . . . . 69
Right . . . . . . . . . . . . . ... 59
4) While monitoring scan tool, accelerate to 2500 RPM and
decelerate to 700 RPM (idle). Scan tool should switch from 0.6-1.0
volt to 0.4 volt or less. If voltage is not as specified, replace
HO2S. If voltage is as specified, go to next step.
5) On 3000GT, go to next step. On Montero, disconnect HO2S
connector and MFI relay connector. Using DVOM, check for continuity
between HO2S connector terminal No. 1 and MFI relay connector terminal
No. 1. If continuity does not exist, repair wiring harness as
necessary. If continuity exists, go to step 7).
6) Disconnect HO2S connector. Turn ignition switch to ON
position. Using DVOM, check voltage between chassis ground and HO2S
connector terminal No. 1. If battery voltage does not exists, repair
wiring harness as necessary. If battery voltage exists, go to next
step.
7) Turn ignition switch to OFF position. With HO2S connector
disconnected, disconnect PCM connector. Using DVOM, check for open or
short circuit between specified HO2S connector terminal and PCM
connector terminal. See
FRONT HO2S-TO-PCM HARNESS TERMINAL IDENTIFICATION table. If open or
short circuit exists, repair wiring harness as necessary. If open or
short circuit does not exist, go to next step.
FRONT HO2S-TO-PCM HARNESS TERMINAL IDENTIFICATION TABLE
Application HO2S Terminal No. PCM Terminal No.
Montero - Federal . . .. 3 . . . . . ... 3
4 . . . . . .. 71
All Others . . . .. (1) 3 . . . . . .. 3
(2) 3 . . . . . .. 4
(1) 4 . . . . . . 71
(2) 4 . . . . . . 72
(1) - Left front HO2S.
(2) - Right front HO2S.
8) Using DVOM, check for continuity between chassis ground
and HO2S connector terminal No. 2. If continuity does not exist,
repair wiring harness as necessary. If continuity exists, go to next
step.
9) Condition required to set DTC is not present at this time.
Test is complete. Intermittent problem may exist. Road test vehicle
(if necessary) and attempt to duplicate conditions that caused
original complaint. Recheck for DTCs. If no DTCs are displayed, go to
INTERMITTENT DTCS.
DTC P0136, P0141, P0156 & P0161: REAR HEATED OXYGEN SENSOR
(HO2S) CIRCUIT FAILURE
NOTE: For terminal identification, see TERMINAL IDENTIFICATION. For
circuit and wire color identification, see
L - WIRING DIAGRAMS article.
1) If using scan tool, go to next step. Disconnect rear HO2S
connector. Install Test Harness (MB998464) between HO2S and HO2S
connector. Using DVOM, check resistance between specified HO2S
connector terminals. See
REAR HO2S HEATER CONNECTOR TERMINAL IDENTIFICATION table. HO2S
resistance should be 12 ohms at 68
F (20
C). If resistance is not as
specified, replace HO2S. If resistance is as specified, go to step 3).
REAR HO2S HEATER CONNECTOR TERMINAL IDENTIFICATION TABLE
Application Terminals No.
Montero . . . . . . . . . . . 1 & 3
3000GT . . . . . . . . . . . . 2 & 4
2) Raise and support drive wheels. Start and warm engine to
operating temperature. Place A/T in Low (M/T in 2nd). Using scan tool,
read HO2S voltage (item 59 for right side or 69 for left side). While
monitoring scan tool, accelerate to 3500 RPM. Scan tool should read 0.
6-1.0 volt. If voltage is not as specified, replace HO2S. If voltage
is as specified, go to next step.
3) On 3000GT, go to next step. On Montero disconnect HO2S
connector and MFI relay connector. Using DVOM, check for continuity
between HO2S connector terminal No. 1 and MFI relay connector terminal
No. 1. If continuity does not exist, repair wiring harness as
necessary. If continuity exists, go to next step.
4) Using DVOM, check for open or short circuit between
specified HO2S connector terminal and PCM connector terminal(s). See
REAR HO2S-TO-PCM WIRING HARNESS TERMINAL IDENTIFICATION table. If open
or short circuit exists, repair wiring harness as necessary. If open
or short circuit does not exist, go to next step.
REAR HO2S-TO-PCM WIRING HARNESS TERMINAL IDENTIFICATION TABLE
Application HO2S Terminal No. PCM Terminal No.
Montero - Federal . . 3 . . . . . . 26
4 . . . . . . 73
All Others . . . (1) 3 . . . . . ... 26
(2) 3 . . . . . ... 27
(1) 4 . . . . . ... 73
(2) 4 . . . . . ... 74
(1) - Left rear HO2S.
(2) - Right rear HO2S.
5) Using DVOM, check for continuity between chassis ground
and specified HO2S connector terminal. See
REAR HO2S CONNECTOR GROUND CIRCUIT IDENTIFICATION table. If continuity
does not exist, repair wiring harness as necessary. If continuity
exists, go to next step.
REAR HO2S CONNECTOR GROUND CIRCUIT IDENTIFICATION TABLE
Application Terminal No.
Montero & 3000GT . . . . . . . . . ... 2
6) Condition required to set DTC is not present at this time.
Test is complete. Intermittent problem may exist. Road test vehicle
(if necessary) and attempt to duplicate conditions that caused
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