CONTROL SYSTEM — ECM Terminal Voltage Inspection (Incorrect Voltage / Possible Cause)
F2-145spec tableReferences diagnostic trouble code troubleshooting (codes 08, 09, 15, 17, 23, 24); TCM references for ATX.
NOTE
B+: Battery positive voltage
ECM Terminal — Incorrect Voltage / Possible Cause
1M
Incorrect voltageAlways 0V
Possible causeOpen or short circuit in wiring from speedometer to ECM terminal 1M
1N
Incorrect voltageAlways below 1.0V
Possible causeP/S pressure switch malfunction (Refer to page F2-157); Short circuit in wiring from P/S pressure switch to ECM terminal 1N; ECM malfunction
1N
Incorrect voltageAlways B+
Possible causeP/S pressure switch malfunction (Refer to page F2-157); Open circuit in wiring from P/S pressure switch to ECM terminal 1N; Open circuit in wiring from P/S pressure switch to ground
1O
Incorrect voltageAlways below 1.5V
Possible causeShort circuit in wiring from A/C amplifier to ECM terminal 1O; A/C amplifier malfunction; ECM malfunction
1O
Incorrect voltageAlways 4.5-5.5V
Possible causeOpen circuit in wiring from A/C amplifier to ECM terminal 1O; A/C amplifier malfunction
1P
Incorrect voltageAlways below 1.0V
Possible causeShort circuit in wiring from A/C amplifier to ECM terminal 1P; A/C amplifier malfunction; ECM malfunction
1P
Incorrect voltageAlways B+
Possible causeOpen circuit in wiring from A/C amplifier to ECM terminal 1P; A/C amplifier malfunction
1Q
Incorrect voltageAlways below 1.0V (Stoplight OK)
Possible causeOpen circuit in wiring from brake switch to ECM terminal 1Q
1R
Incorrect voltageAlways below 1.0V (Neutral/clutch switch OK)
Possible causeShort circuit in wiring from neutral/clutch switch to ECM terminal 1R
1R
Incorrect voltageAlways B+
Possible causeOpen circuit in wiring from neutral/clutch switch to ECM terminal 1R
1R
Incorrect voltageAlways below 1.0V (Transaxle range switch OK)
Possible causeShort circuit in wiring from ECM terminal 1R to TCM terminal 1D
1R
Incorrect voltageAlways B+
Possible causeOpen circuit in wiring from ECM terminal 1R to TCM terminal 1D
1S
Incorrect voltageAlways 0V
Possible causeOpen or short circuit in wiring from ECM terminal 1S to TCM terminal 2M
1T
Incorrect voltageAlways below 1.0V
Possible causeShort circuit in wiring from throttle position sensor to ECM terminal 1T; ECM malfunction; Throttle position sensor misadjusted
1T
Incorrect voltageAlways B+
Possible causeOpen circuit in wiring from throttle position sensor to ECM terminal 1T; ECM malfunction
1U
Incorrect voltage—
Possible cause—
1V
Incorrect voltageAlways B+
Possible causeOpen circuit in wiring from ECM terminal 1V to TCM terminal 1A
1V
Incorrect voltageAlways 0V
Possible causeShort circuit in wiring from ECM terminal 1V to TCM terminal 1A
2A
Incorrect voltage—
Possible cause—
2B
Incorrect voltageAlways below 2.0V or Approx. 4V
Possible causeRefer to code No. 08 Troubleshooting (Refer to page F2-80)
2C
Incorrect voltage0V after warm-up
Possible causeRefer to code No. 23 Troubleshooting (Refer to page F2-84)
2C
Incorrect voltageAlways approx. 1V after warm-up
Possible causeRefer to code No. 24 Troubleshooting (Refer to page F2-86)
2D
Incorrect voltage0V after warm-up
Possible causeRefer to code No. 15 Troubleshooting (Refer to page F2-84)
2D
Incorrect voltageAlways approx. 1V after warm-up
Possible causeRefer to code No. 17 Troubleshooting (Refer to page F2-86)
2E
Incorrect voltageAlways approx. 0V or approx. 5V
Possible causeRefer to code No. 09 Troubleshooting (Refer to page F2-81)
2F
Incorrect voltageAlways constant
Possible causeOpen circuit in wiring from ECM terminal to throttle position sensor
2F
Incorrect voltageAlways above 1V
Possible causeThrottle position sensor misadjusted