CONTROL SYSTEM — ECM Terminal Voltage Inspection (Incorrect Voltage / Possible Cause)

F2-147spec table

References diagnostic trouble code troubleshooting (codes 02, 03, 04, 05, 10, 16, 26, 41, 46).

NOTE

B+: Battery positive voltage

ECM Terminal — Incorrect Voltage / Possible Cause

Terminal	Incorrect voltage	Possible cause
2H	—	—
2I	Always approx. 0V	Short circuit in wiring from ECM
2J	Always approx. 0V or approx. 5V	Refer to code No. 16 Troubleshooting (Refer to page F2-85)
2K	Always 0V	Refer to code No. 10 Troubleshooting (Refer to page F2-82)
2L	Always 0V (DRL system OK)	Open or short circuit in wiring from DRL relay to ECM terminal 2L
2M	Always 0V or B+	Refer to code No. 05 Troubleshooting (Refer to page F2-79)
2N	—	—
2O	Always 0V or approx. 5V	Refer to code No. 26 Troubleshooting (Refer to page F2-88)
2P	Always below 2V or B+	Open or short circuit in wiring from coolant fan relay to ECM terminal 2P; ECM malfunction
3A	Above 0V	Poor connection at ground terminal; Open circuit in wiring from ECM
3B	Above 0V	Poor connection at ground terminal; Open circuit in wiring from ECM
3C	Above 0V	Poor connection at ground terminal; Open circuit in wiring from ECM
3D	Above 0V	Poor connection at ground terminal; Open circuit in wiring from ECM
3E	Always approx. 0V or approx. 5V	Refer to code No. 04 Troubleshooting (Refer to page F2-78)
3F	Above 0V	Poor connection at ground terminal; Open circuit in wiring from ECM
3G	Always approx. 0V or approx. 5V	Refer to code No. 03 Troubleshooting (Refer to page F2-77)
3H	0V	Refer to code No. 02 Troubleshooting (Refer to page F2-76)
3I	Always approx. 0V or B+	Refer to code No. 41 Troubleshooting (Refer to page F2-91)
3J	Always approx. 0V or B+	Refer to code No. 46 Troubleshooting (Refer to page F2-91)
3K	—	—
3L	Always below 1.0V or B+	Open or short circuit in wiring from coolant fan relay to ECM terminal 3L; ECM malfunction
3M	Always below 1.0V or B+	Refer to code No. 26 Troubleshooting (Refer to page F2-88)
3N	Always below 2.0V	Open or short circuit in wiring from condenser fan relay to ECM terminal 3N; ECM malfunction

Incorrect voltage—

Possible cause—

Incorrect voltageAlways approx. 0V

Possible causeShort circuit in wiring from ECM

Incorrect voltageAlways approx. 0V or approx. 5V

Possible causeRefer to code No. 16 Troubleshooting (Refer to page F2-85)

Incorrect voltageAlways 0V

Possible causeRefer to code No. 10 Troubleshooting (Refer to page F2-82)

Incorrect voltageAlways 0V (DRL system OK)

Possible causeOpen or short circuit in wiring from DRL relay to ECM terminal 2L

Incorrect voltageAlways 0V or B+

Possible causeRefer to code No. 05 Troubleshooting (Refer to page F2-79)

Incorrect voltage—

Possible cause—

Incorrect voltageAlways 0V or approx. 5V

Possible causeRefer to code No. 26 Troubleshooting (Refer to page F2-88)

Incorrect voltageAlways below 2V or B+

Possible causeOpen or short circuit in wiring from coolant fan relay to ECM terminal 2P; ECM malfunction

Incorrect voltageAbove 0V