Mazda B-Series 1998-06

2.3L L4 VIN D Std 4

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Trouble Code: P1507



Idle Air Control System RPM Lower Than Expected

Possible Causes:



Air filter element is severely restricted, or air inlet is plugged
 
Base engine problems: cylinder compression or valve timing
 
IAC valve is stuck in one position (it may be dirty or has failed)
 
IAC solenoid or valve is damaged or has failed
 
Throttle body is dirty, damaged or contaminated
 
PCM has failed
 

Trouble Code: P1518



Intake Manifold Runner Control Shutter Valve (Stuck Open)

Possible Causes:



IMRC control circuit shorted to ground or to system power (B+)
 
IMRC shutter valve actuator is stuck closed
 
IMRC vacuum hose is loose or disconnected
 
PCM has failed
 

Trouble Code: P1519



Intake Manifold Runner Control Shutter Valve (Stuck Open)

Possible Causes:



IMRC control circuit shorted to ground or to system power (B+)
 
IMRC shutter valve actuator is stuck closed
 
IMRC vacuum hose is loose or disconnected
 
PCM has failed
 

Trouble Code: P1520



Intake Manifold Runner Control Circuit Malfunction

Possible Causes:



IMRC control circuit is open
 
IMRC control circuit is shorted to ground
 
IMRC power circuit open or shorted to ground (check the fuse)
 
PCM has failed
 

Trouble Code: P1537



Bypass Air Solenoid Circuit Malfunction

Possible Causes:



Bypass air solenoid control circuit is open or shorted to ground
 
Bypass air solenoid power circuit is open
 
Bypass air solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1538



Bypass Air Solenoid Circuit Malfunction

Possible Causes:



Bypass air solenoid control circuit is open or shorted to ground
 
Bypass air solenoid power circuit is open
 
Bypass air solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1633



PCM Long Term Memory Interruption

Possible Causes:



KAM circuit is open between battery and the PCM connector
 
KAM circuit is shorted to ground (check for a blown fuse)
 
KAM circuit has high resistance at the battery connections
 
PCM has failed
 

Trouble Code: P1639



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: P1650



Power Steering Pressure Switch Circuit Malfunction (Self-Test)

Possible Causes:



PSP signal circuit is open or shorted to ground
 
PSPS ground circuit is open (at the switch mounting point)
 
PSPS is damaged or has failed
 
PCM has failed
 

Trouble Code: P1709



Clutch Pedal Position Switch Circuit Malfunction (Self-Test)

Possible Causes:



CPP switch circuit is open between the switch and the PCM
 
CPP switch circuit is shorted between the switch and the PCM
 
TR switch is damaged or has failed
 
PCM has failed
 

 
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