TOYOTA LAND CRUISER 1986 Factory Repair Manual

A19521A19629
BATT(+)
ECM Connector E7E9E1 (-)
DI-292
- DIAGNOSTICSENGINE
485 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2 Check voltage between terminal BATT and E1 of ECM connector.
CHECK:
Measure the voltage between terminals of the E7 and E9 ECM
connector.
OK:
Tester ConnectionSpecified Condition
BATT (E9-3) - E1 (E7-1)9 to 14 V
OK Check for intermittent problems (See page
DI-3).
NG

A19976EFI or ECD No. 1 Fuse Engine Room J/B
A21033
E9
BATT
ECM Connector
- DIAGNOSTICSENGINE
DI-293
486 Author
: Date
:
2004 LAND CRUISER (RM1071U)
3 Check for open and short in harness and connector between ECM and EFI or
ECD No. 1 fuse, EFI or ECD No. 1 fuse and battery.
Check the harness and the connector between the EFI or
ECD No. 1 fuse and the ECM:
PREPARATION:
(a) Remove the EFI or ECD No. 1 fuse from the engine room
J/B.
(b) Disconnect the E9 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tor.
OK:
Tester ConnectionSpecified Condition
Engine Room J/B (EFI or ECD No. 1
fuse terminal 2) -
BATT (E9-3)
Below 1 W
Engine Room J/B (EFI or ECD No. 1
fuse terminal 2) or
BATT (E9-3) - Body ground
10 kW or higher
Check the harness and connector between the EFI or ECD
No. 1 fuse and the battery:
PREPARATION:
(a) Remove the EFI or ECD No. 1 fuse from the engine room
J/B.
(b) Disconnect the battery positive terminal.
CHECK:
Measure the resistance between the wire harness side connec-
tor.
OK:
Tester ConnectionSpecified Condition
Engine Room J/B (EFI or ECD No. 1
fuse terminal 1) -
Battery positive terminal
Below 1 W
Engine Room J/B (EFI or ECD No. 1
fuse terminal 1) or
Battery positive terminal - Body ground
10 kW or higher
NG Repair or replace harness or connector.
OK
Check and replace engine room J/B.

DI-294
- DIAGNOSTICSENGINE
487 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0604 Internal Control Module Random Access
Memory (RAM) Error
DTC P0606 ECM/PCM Processor
DTC P0607 Control Module Performance
DTC P0657 Actuator Supply Voltage Circuit / Open
MONITOR DESCRIPTION
The ECM continuously monitors its internal memory status, internal circuits, and output signals to the throttle
actuator. This self-check insures that the ECM is functioning properly. If any malfunction is detected, the
ECM will set the appropriate DTC and illuminate the MIL.
The ECM memory status is diagnosed by internal ºmirroringº of the main CPU and the sub CPU to detect
RAM (Random Access Memory) errors. The two CPUs also perform continuous mutual monitoring.
The ECM sets a DTC if: 1) outputs from the 2 CPUs are different and deviate from the standards, 2) the sig-
nals to the throttle actuator deviate from the standards, 3) a malfunction is found in the throttle actuator sup-
ply voltage, and 4) any other ECM malfunction is found.
DTC No.DTC Detecting ConditionTrouble Area
P0604
P0606
P0607
P0657
ECM malfunction
ECM
MONITOR STRATEGY
P0604Random access memory (RAM) error range
check
Related DTCsP0606ECM range check/description
P0657Actuator supply voltage circuit range check
Required sensors/componentsECM
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
The typical enabling condition is not avail-
able-
DI1MF-1 1

- DIAGNOSTICSENGINE
DI-295
488 Author
: Date
:
2004 LAND CRUISER (RM1071U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P0604:
RAM mirror check failure
P0606:
ECM error
P0657:
ECM error
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, as well as other data from the time when a malfunction occurred.
Replace ECM (See page SF-60).

DI-296
- DIAGNOSTICSENGINE
489 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0617 Starter Relay Circuit High
MONITOR DESCRIPTION
While the engine is being cranked, the battery positive voltage is applied to terminal STA of the ECM.
If the vehicle is being driven and the ECM detects the starter control signal (STA), the ECM concludes that
the starter control circuit is malfunctioning. The ECM will turn on the MIL and a DTC is set.
DTC No.DTC Detection ConditionTrouble Area
P0617
When all conditions (a), (b) and (c) are satisfied for 20 seconds
with battery (+B) voltage 10.5 V or more
(a) Vehicle speed
20 km/h (12.4 mph)
(b) Engine revolution
1,000 rpm
(c) STA signal ON
Park/neutral position switch

Starter relay circuit

Ignition switch

ECM
MONITOR STRATEGY
Related DTCsP0617Starter signal error
Rid / tMain sensors/componentsStarter signalRequired sensors/componentsRelated sensors/componentsVehicle speed sensor, Engine speed sensor
Frequency of operationContinuous
Duration20 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Battery voltage10.5 V-
Vehicle speed20 km/h (12.4 mph)-
Engine speed1,000 rpm-
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Starter signalON (at ºmore than 20 km/h (12.4 mph) and more than 1,000 rpmº)
DIC2N-01

A21365
J/B No. 5
J/B No. 6ECM J17
J/C
Cowl Side J/B LH
Cowl Side J/B RH
ACC CUT Relay
J/B No. 6 Cowl Side J/B LH
ACC Relay
To
Audio
etc.
Engine Room R/B
Engine Room J/BSTARTER Relay
STARTERE6
E5
E7
E5 6D
6D
6D 6D
6C
6B
6B P
N 5C 5D
2A
2E
3C 3Q 3Q
3Q
6D 6B
2E
2E
2C
1
1
11
1B
1B
1B1D
1CIX1IX1
IX1
ED1
S1
S2 F15
F16
F17STAR
STA
STSW
ACCR
FL Block
MAIN
J/B No. 2
J/B No. 3ALTBatteryStarter9
17
12
15 A
A 9
614 15
3
16
5 6
4
7
AM2 ST2
AM1 ACC
2
3 78 14 3
10
41
1 5250
51
1 234
3
2
5
40
39
121
53 AM1
12
53 2
9 39
1
1
1
1 2
1
1 B-R
B-W
B-W
W-R
W-R
B-R
B-R B-W
SB
SB
B-G
SB
SB
R-G B
B
B-R
B-R
B-R
B-R SB
B-W
B-G
B-Y
W-BB-W
W-B
W-B W-RB-W
B-R B-G
B-G
B-GEE
IF 43
AM2
B-G
12
P1
Park/Neutral
Position SW
B-WB-R
B-R
B-WB-W
If1
If112
9
I18 Ignition SW
B 7A
7A
4 3
- DIAGNOSTICSENGINE
DI-297
490 Author
: Date
:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM

DI-298
- DIAGNOSTICSENGINE
491 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, as well as other data from the time when a malfunction occurred.
Hand-held tester:
1 Connect hand-held tester, and check STA signal.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand-held tester main switch ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STARTER SIG.
CHECK:
Read the STA signal on the hand-held tester while the starter operates.
OK:
Ignition Switch PositionONSTART
STA SignalOFFON
OK Go to step 5.
NG
2 Check park/neutral position switch (See page DI-402).
NG Replace park/neutral position switch.
Go to next step 5 after the replacement.
OK
3 Check ignition switch (See page BE-29).
NG Replace ignition switch.
Go the next step 5 after the replacement.
OK

- DIAGNOSTICSENGINE
DI-299
492 Author
: Date
:
2004 LAND CRUISER (RM1071U)
4 Connect hand-held tester, and check STA signal.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand-held tester main switch ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STARTER SIG.
CHECK:
Read the STA signal on the hand-held tester while the starter operates.
OK:
Ignition Switch PositionONSTART
STA SignalOFFON
NG Repair or replace harness or connector.
OK
5 Check DTC reoccur.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and hand-held tester main switch ON.
(c) Clear DTC (See page DI-3).
(d) Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more.
CHECK:
Check DTC reoccur.
RESULT:
Display (DTC output)Proceed to
P0617A
No DTC outputB
A Replace ECM (See page SF-60).
B
Check for intermittent problems (See page
DI-3).

A19522A19630
STA(+)
E5
ECM Connector
DI-300
- DIAGNOSTICSENGINE
493 Author
: Date
:
2004 LAND CRUISER (RM1071U)
OBD II scan tool (excluding hand-held tester):
1 Check voltage between terminal STA of ECM connector and body ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal STA of the ECM connec-
tor and the body ground, while cranking the engine (ignition
switch START position) and while not engine cranking the en-
gine (ignition switch position ON).
OK:
Voltage:
6 V or more (ignition switch START position)
0 V (ignition switch ON position)
OK Go to step 5.
NG
2 Check park/neutral position switch (See page DI-402).
NG Replace park/neutral position switch.
Go to next step 5 after the replacement.
OK
3 Check ignition switch (See page BE-29).
NG Replace ignition switch.
Go to next step 5 after the replacement.
OK

A19522A19630
STA(+)
E5
ECM Connector
- DIAGNOSTICSENGINE
DI-301
494 Author
: Date
:
2004 LAND CRUISER (RM1071U)
4 Check voltage between terminal STA of ECM connector and body ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal STA of the ECM connec-
tor and the body ground, while cranking the engine (ignition
switch START position) and while not engine cranking the en-
gine (ignition switch position ON).
OK:
Voltage:
6 V or more (ignition switch START position)
0 V (ignition switch ON position)
NG Repair or replace harness or connector.
OK
5 Check DTC reoccur.
PREPARATION:
(a) Connect the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and hand-held tester main switch ON.
(c) Clear DTC (See page DI-3).
(d) Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more.
CHECK:
Check DTC reoccur.
RESULT:
Display (DTC output)Proceed to
P0617A
No DTC outputB
A Replace ECM (See page SF-60).
B
Check for intermittent problems (See page
DI-3).