Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (See FREEZE FRAME DATA ).

INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

Disconnect the B26, B27, B28, B29, B30 or B31 ignition coil connector.
Turn the engine switch on (IG).

Measure the voltage according to the value(s) in the table below.

Standard voltage

VOLTAGE SPECIFICATION TABLE

Tester Connection	Specified Condition
B26-1 - Body ground	9 to 14 V
B27-1 - Body ground	9 to 14 V
B28-1 - Body ground	9 to 14 V
B29-1 - Body ground	9 to 14 V
B30-1 - Body ground	9 to 14 V
B31-1 - Body ground	9 to 14 V

Measure the resistance according to the value(s) in the table below.

Fig 1: Identifying B26, B27, B28, B29, B30 Or B31 Ignition Coil Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

RESISTANCE REFERENCE TABLE

Tester Connection	Specified Condition
B26-4 - Body ground	Below 1 Ω
B27-4 - Body ground	Below 1 Ω
B28-4 - Body ground	Below 1 Ω
B29-4 - Body ground	Below 1 Ω
B30-4 - Body ground	Below 1 Ω
B31-4 - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM (IGT SIGNAL TERMINAL))

Disconnect the B26, B27, B28, B29, B30 or B31 ignition coil connector.
Disconnect the ECM B12 connectors.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

RESISTANCE REFERENCE (CHECK FOR OPEN)

Tester Connection	Specified Condition
IGT1 (B26-3) - IGT1 (B12-40)	Below 1 Ω
IGT2 (B27-3) - IGT2 (B12-39)	Below 1 Ω
IGT3 (B28-3) - IGT3 (B12-38)	Below 1 Ω
IGT4 (B29-3) - IGT4 (B12-37)	Below 1 Ω
IGT5 (B30-3) - IGT5 (B12-36)	Below 1 Ω
IGT6 (B31-3) - IGT6 (B12-35)	Below 1 Ω

Standard resistance (Check for short)

RESISTANCE REFERENCE (CHECK FOR SHORT)

Tester Connection	Specified Condition
IGT1 (B26-3) or IGT1 (B12-40) - Body ground	10 kΩ or higher
IGT2 (B27-3) or 1GT2 (B12-39) - Body ground	10 kΩ or higher
1GT3 (B28-3) or IGT3 (B12-38) - Body ground	10 kΩ or higher
IGT4 (B29-3) or IGT4 (B12-37) - Body ground	10 kΩ or higher
IGT5 (B30-3) or IGT5 (B12-36) - Body ground	10 kΩ or higher
IGT6 (B31-3) or IGT6 (B12-35) - Body ground	10 kΩ or higher

Fig 2: Identifying B26, B27, B28, B29, B30 Or B31 Ignition Coil Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance (Check for open)

RESISTANCE REFERENCE (CHECK FOR OPEN)

Tester Connection	Specified Condition
IGF (B26-2) - IGF1 (B12-106)	Below 1 Ω
IGF (B27-2) - IGF1 (B12-106)	Below 1 Ω
IGF (B28-2) - IGF1 (B12-106)	Below 1 Ω
IGF (B29-2) - IGF1 (B12-106)	Below 1 Ω
IGF (B30-2) - IGF1 (B12-106)	Below 1 Ω
IGF (B31-2) - IGF1 (B12-106)	Below 1 Ω

Standard resistance (Check for short)

RESISTANCE REFERENCE (CHECK FOR SHORT)

Tester Connection	Specified Condition
IGF (B26-2) or IGF1 (B12-106) - Body ground	10 kΩ or higher
IGF (B27-2) or IGF1 (B12-106) - Body ground	10 kΩ or higher
IGF (B28-2) or IGF1 (B12-106) - Body ground	10 kΩ or higher
IGF (B29-2) or IGF1 (B12-106) - Body ground	10 kΩ or higher
IGF (B30-2) or IGF1 (B12-106) - Body ground	10 kΩ or higher
IGF (B31-2) or IGF1 (B12-106) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

PERFORM SIMULATION TEST

Clear the DTC (s) (See DTC CHECK/CLEAR ).
Change the arrangement of the ignition coils (with igniters).
NOTE: Do not change the location of the connectors.

Perform a simulation test.

Result

RESULT REFERENCE

Display (DTC Output)	Proceed to
Same DTCs (that have been erased)	A
Other DTCs	B

B: REPLACE IGNITION COIL ASSEMBLY

A: REPLACE ECM (See REMOVAL )