1986 TOYOTA LAND CRUISER ignition

A21226
Wire Harness Side:
+B
Mass Air Flow Meter Connector
M1
A19522A19630
VG E5ECM Connector E2G
- DIAGNOSTICSENGINE
DI-61
254 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2 Check voltage of mass air flow meter power source.
PREPARATION:
(a) Disconnect the M1 mass air flow meter connector.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal of the mass air flow meter
connector and body ground.
OK:
Tester ConnectionSpecified Condition
+B (M1-3) - Body ground9 to 14 V
NG Go to step 5.
OK
3 Check voltage between terminal VG of ECM connector and body ground.
PREPARATION:
Start the engine.
CHECK:
Measure the voltage between the specified terminal of the E5
ECM connector.
HINT:
The shift position should be P or N and the A/C switch should
be turned OFF.
OK:
Tester ConnectionConditionSpecified Condition
VG (E5-30) -
E2G (E5-29)Engine is idling0.5 to 3.0 V
OK Replace ECM (See page SF-60).
NG

- DIAGNOSTICSENGINE
DI-67
260 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help deter-
mine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean
or rich, and other data from the time the malfunction occurred.
1 Are there any other codes (besides DTC P0101) being output?
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to DLC3.
(b) Turn the ignition switch ON and push the hand-held tester or OBD II scan tool main switch ON.
(c) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand-held tester or the OBD ll scan tool.
RESULT:
Display (DTC output)Proceed to
ºP0101º and other DTCsA
Only P0101B
HINT:
If any other codes besides P0101 are output, perform the troubleshooting for those codes first.
B Replace mass air flow meter.
A
Go to relevant DTC chart (See page DI-36).

- DIAGNOSTICSENGINE
DI-71
264 Author
: Date
:
2004 LAND CRUISER (RM1071U)
1 Connect OBD II scan tool or hand-held tester, and read value of intake air tem-
perature.
PREPARATION:
(a) Connect the OBD II scan tool or the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or the hand-held tester main switch ON.
(c) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA
LIST / ALL / INTAKE AIR.
CHECK:
Read the temperature value on the OBD II scan tool or the hand-held tester.
OK:
Same as actual intake air temperature.
RESULT:
Temperature DisplayedProceed to
-40°C (-40°F)A
140°C (284°F) or moreB
OK (Same as present temperature)C
HINT:

If there is an open circuit, the OBD II scan tool or the hand-held tester indicates -40°C (-40°F).

If there is a short circuit, the OBD II scan tool or the hand-held tester indicates 140°C (284°F) or more.
B Go to step 4.
C Check for intermittent problems
(See page DI-3).
A

A19549
THA
E2ECM
2
1
Mass Air
Flow Meter Mass Air
Flow Meter
12
M1
THA E2
M1
DI-72
- DIAGNOSTICSENGINE
265 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the M1 mass air flow meter connector.
(b) Connect terminals 1 and 2 of the mass air flow meter wire
harness side connector.
(c) Turn the ignition switch ON.
(d) When using hand-held tester, enter the following menus:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / IN-
TAKE AIR.
CHECK:
Read the temperature value on the OBD II scan tool or the
hand-held tester.
OK:
Temperature value: 1405C (2845F) or more
OK Confirm good connection at sensor. If OK, re-
place mass air flow meter.
NG

A19548THA
E2
THA
E2ECM Mass Air Flow Meter
M1
E5
ECM Connector
A19550
THA
E2ECM Mass Air Flow
Meter
M1
- DIAGNOSTICSENGINE
DI-73
266 Author
: Date
:
2004 LAND CRUISER (RM1071U)
3 Check for open in harness or ECM.
PREPARATION:
(a) Connect terminals THA and E2 of the E5 ECM connector.
HINT:
Before checking, do a visual and contact pressure checks for
the ECM connector.
(b) Turn the ignition switch ON.
(c) When using hand-held tester, enter the following menus:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / IN-
TAKE AIR.
CHECK:
Read the temperature value on the OBD II scan tool or the
hand-held tester.
OK:
Temperature value: 1405C (2845F) or more
OK Repair or replace harness or connector.
NG
Confirm good connection at ECM. If OK,
check and replace ECM (See page SF-60).
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the M1 mass air flow meter connector.
(b) Turn the ignition switch ON.
(c) When using hand-held tester, enter the following menus:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / IN-
TAKE AIR.
CHECK:
Read the temperature value on the OBD II scan tool or the
hand-held tester.
OK:
Temperature value: -405C (-405F)
OK Replace mass air flow meter.
NG

A19551A19635
ECM Mass Air Flow Meter
THA
E2 M1
E5
DI-74
- DIAGNOSTICSENGINE
267 Author
: Date
:
2004 LAND CRUISER (RM1071U)
5 Check for short in harness or ECM.
PREPARATION:
(a) Disconnect the E5 ECM connector.
(b) Turn the ignition switch ON.
(c) When using hand-held tester, enter the following menus:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / IN-
TAKE AIR.
CHECK:
Read the temperature value on the OBD II scan tool or the
hand-held tester.
OK:
Temperature value: -405C (-405F)
OK Repair or replace harness or connector.
NG
Replace ECM (See page SF-60).

DI-78
- DIAGNOSTICSENGINE
271 Author
: Date
:
2004 LAND CRUISER (RM1071U)
1 Connect OBD II scan tool or hand-held tester, and read value of engine coolant
temperature.
PREPARATION:
(a) Connect the OBD II scan tool or the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON.
(c) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA
LIST / ALL / COOLANT TEMP.
CHECK:
Read the temperature value on the OBD II scan tool or the hand-held tester.
OK:
Same value as actual engine coolant temperature.
RESULT:
Temperature DisplayedProceed to
-40°C (-40°F)A
140°C (284°F) or moreB
OK (Same as present temperature)C
HINT:

If there is an open circuit, OBD II scan tool or hand-held tester indicates -40°C (-40°F).

If there is a short circuit, OBD II scan tool or hand-held tester indicates 140°C (284°F) or more.
B Go to step 4.
C Check for intermittent problems
(See page DI-3).
A

A19552
Engine Coolant
Temp. Sensor
2
1THW
E2ECM
E2
- DIAGNOSTICSENGINE
DI-79
272 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the E2 engine coolant temperature (ECT)
sensor connector.
(b) Connect terminals 1 and 2 of the engine coolant tempera-
ture sensor wire harness side connector.
(c) Turn the ignition switch ON.
(d) When using hand-held tester, enter the following menus:
DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL /
COOLANT TEMP.
CHECK:
Read the temperature value on the OBD II scan tool or the
hand-held tester.
OK:
Temperature value: 1405C (2845F) or more
OK Confirm good connection at sensor. If OK, re-
place engine coolant temperature sensor.
NG