Mazda Car 2002-04

1.8L L4 - Std 3

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Trouble Code: P1634



Generator Battery Terminal Open Circuit Malfunction

Possible Causes:



Generator Battery Terminal circuit is open
 
Generator is damaged or has failed (i.e., no Generator output)
 
Battery has failed (it is unable to accept a charge)
 
PCM has failed
 

Trouble Code: P1794



Battery Direct To PCM Circuit Malfunction

Possible Causes:



KAM circuit is open (the problem may be intermittent)
 
KAM circuit is shorted to ground (KAM fuse is blown)
 
KAM circuit connection loose in wiring harness or at the PCM
 
PCM has failed
 

Trouble Code: P1797



Clutch or Neutral Switch Circuit Malfunction

Possible Causes:



Clutch or Neutral switch signal is open or shorted to ground
 
Clutch or Neutral switch signal is shorted to system power (B+)
 
Clutch or Neutral switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P0031



HO2S-11 (Bank 1 Sensor 1) Heater Circuit Low Input

Possible Causes:



HO2S heater control circuit is shorted to chassis ground
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0032



HO2S-11 (Bank 1 Sensor 1) Heater Circuit High Input

Possible Causes:



HO2S heater control circuit is shorted to system power (B+)
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0037



HO2S-12 (Bank 1 Sensor 2) Heater Circuit Low Input

Possible Causes:



HO2S heater control circuit is shorted to chassis ground
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0038



HO2S-12 (Bank 1 Sensor 2) Heater Circuit High Input

Possible Causes:



HO2S heater control circuit is shorted to system power (B+)
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0128



Thermostat Malfunction

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT sensor has failed
 
PCM has failed
 

Trouble Code: P0138



HO2S-12 (Bank 1 Sensor 2) Lack of Switching (Too Rich)

Possible Causes:



HO2S signal tracking (wet/oily) in connector causing a short between the signal circuit and heater power circuit
 
HO2S signal circuit is shorted to system power
 
HO2S contaminated with wrong fuel, has deteriorated or failed
 
PCM has failed
 

Trouble Code: P0140



HO2S-12 (Bank 1 Sensor 2) Circuit No Activity Detected

Possible Causes:



Air leaks in the intake manifold or exhaust manifold or pipes
 
IAT sensor or MAF sensor has deteriorated (out of calibration)
 
HO2S signal circuit is open or shorted to ground
 
HO2S contaminated with wrong fuel, has deteriorated or failed
 
TSB 0100700 (3/00) contains information for this code ()
 

Trouble Code: P0660



Variable Inertia Charging System Circuit Malfunction

Possible Causes:



VICS control circuit is open or shorted to ground
 
VICS power circuit is open (check the power from the relay)
 
VICS valve is damaged or has failed
 
PCM has failed
 

Trouble Code: P1000



OBD II Monitor Testing No Completed

Possible Causes:



A PCM Reset step was performed with an OBD II Scan Tool
 
Battery keep alive power (KAPWR) was removed to the PCM
 
One or more OBD II Monitors did not complete during an official OBD II Drive Cycle
 

 
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