DTC P128A: CHT Sensor Circuit Intermittent/Erratic: Notes

DTC P128A CHART (MZI-3.7)

DTC P128A	CHT sensor circuit intermittent/erratic
DETECTION CONDITION	Indicates the CHT circuit became intermittently open or short while the engine was running.
POSSIBLE CAUSE	CHT sensor connector or terminals malfunction Short to ground in wiring harness between CHT sensor terminal A and PCM terminal 2AV PCM connector or terminals malfunction Short to power supply in wiring harness between CHT sensor terminal A and PCM terminal 2AV Open circuit in wiring harness between the following terminals: CHT sensor terminal A-PCM terminal 2AV CHT sensor terminal B-PCM terminal 2G CHT sensor malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.