Toyota p1222

DI−91 DIAGNOSTICS

−

ENGINE DIDYN−01

CIRCUIT INSPECTION DTC

P1222/15 Throttle Motor Circuit

CIRCUIT DESCRIPTION The throttle control motor is operated by the engine ECU and it opens and closes the throttle valve. The fully open condition of the throttle valve is detected by the diesel throttle position switch, which is mounted on the throttle body. If this DTC is stored, the engine ECU shuts down the power for the throttle control motor. DTC No.

DTC Detection Condition

O Open or short h t in i throttle th ttl control t l motor t circuit i it P1222/15 Open or short in diesel throttle position switch circuit

1HD−FTV ENGINE SUP (RM1179E)

Trouble Area S Open or short in throttle control motor circuit S Open or short in diesel throttle position switch circuit S Throttle control motor S Throttle valve S Throttle drive gear S Diesel throttle body S Diesel throttle position switch S Engine ECU

DI−92 DIAGNOSTICS

−

ENGINE

WIRING DIAGRAM T3 Diesel Throttle Control Motor Cowl Side J/B LH 5 2A

B−Y +B1 2

EFI OR ECD NO. 2 45 2Q

1 IV2

SB

B−Y

B−Y +B2 5

B−Y B−W 1

1

4

1

15

3

E16 LU+A 13 E16 LU+B

14 G−W LU−A E16 LU−A 4 12 G LU−B E16 LU−B 1

B−W

8 E19 MREL

1 W−B

G−Y

44 1B

11 1B

EFI OR ECD NO. 1

1 1C

43

B−G F37 MAIN Fusible Link Block

Engine Room J/B

1A W−B

1B

39

GR

D32 Diesel Throttle Position Switch

15 E17 THOP 17 E16 E01

W−B

B Battery

LU+B

2 5C

5D

2 1

2

V

15

J/B No. 5

EFI OR ECD Engine Room R/B Relay 3

G−R LU+A 6

Engine ECU

1 W−B 2 BR

Battery EA

EE

ED

ED

A23871


DI−93 DIAGNOSTICS

−

ENGINE

INSPECTION PROCEDURE HINT: Read freeze frame data using the intelligent tester II. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

1

Check throttle control motor circuit. Signal Waveform 10 V/ Division

GND

0.5 msec./Division

A09818

PREPARATION: (a) Connect t he oscilloscope bet ween t er m inals LU+ A, LU+B, LU−A, LU−B and E01 of the engine ECU. (b) Start the engine. CHECK: Check the waveform between terminals LU+A, LU+B, LU−A, LU−B and E01 of the engine ECU when the engine is racing. OK: The correct waveforms are as shown. OK

Go to step 5.

NG

2

Check voltage of throttle control motor circuit. PREPARATION: (a) Disconnect the throttle control motor. (b) Turn the ignition switch ON. CHECK: Measure the voltage between terminals 2 and 5 of the throttle control motor connector and body ground. OK: Voltage: 9 to 14 V

+B1

+B2 A23893

NG

OK


Check for open in harness and connector between EFI OR ECD relay and throttle control motor (See page IN−19).

DI−94 DIAGNOSTICS

3

−

ENGINE

Check throttle control motor.

Ohmmeter 3 2 1 6 5 4

A16946

PREPARATION: Disconnect the throttle control motor connector. CHECK: S Measure the resistance between terminals 1, 3 and 2 of the throttle control motor. S Measure the resistance between terminals 4, 6 and 5 of the throttle control motor. OK: Resistance: 18 to 22 W at 20˚C (68˚F) NG

Replace diesel throttle body assembly (See Pub No. RM896E, page ED−1).

OK

4

Check for open and short in harness and connector between throttle control motor and engine ECU (See page IN−19).

NG

OK

Check and replace engine ECU (See page IN−19).


Repair or replace harness or connector.

DI−95 DIAGNOSTICS

5

−

ENGINE

Check diesel throttle position switch. PREPARATION: Disconnector the diesel throttle position switch. CHECK: Measure the resistance between terminal of the diesel throttle position switch. OK:

Ohmmeter

A23900

NG

Throttle Valve Position

Diesel throttle position switch signal

Fully closed

10 kW or higher

Fully open

Below 1 W

Replace diesel throttle body assembly (See Pub No. RM896E, page ED−1).

OK

6

Check for open and short in harness and connector between diesel throttle position switch and engine ECU (See page IN−19).

NG


OK

7

Check for open and short in harness and connector between diesel throttle position switch and body ground (See page IN−19).

NG

OK

Check and replace engine ECU (See page IN−19).



Toyota p1222

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