Miata 1990-1997

1.8L L4 VIN - Std 2

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Trouble Code: P1485



EGR (Vacuum)--Open or Short

Possible Causes:



EGR solenoid valve (vacuum) malfunction
 
Open or short circuit in wiring from EGR solenoid valve (vacuum) terminal A to main relay terminal D
 
Open or short circuit in wiring from EGR solenoid valve (vacuum)terminal B to ECM terminal 4P
 

Trouble Code: P1486



EGR (Vent)--Open or Short

Possible Causes:



-EGR solenoid valve (vent) malfunction
 
-Open or short circuit in wiring from EGR solenoid valve (vent) terminal A to main relay terminal D
 
-Open or short circuit in wiring from EGR solenoid valve (vent) terminal B to ECM terminal 4O
 

Trouble Code: P1601



Communication Line Error (PCM-TCM)

Possible Causes:



Poor connection at PCM or TCM connector
 
Short to GND circuit between PCM terminal 4Z and TCM terminal O.
 
Short to GND circuit between PCM terminal 4AC and TCM terminal AL.
 
Open circuit between PCM terminal 4Z and TCM terminal O.
 
Open circuit between PCM terminal 4AC and TCM terminal AL.
 
Short to power circuit between PCM terminal 4Z and TCM terminal O.
 
Short to power circuit between PCM terminal 4AC and TCM terminal AL.
 
TCM malfunction.
 
PCM malfunction.
 

Trouble Code: P1608



PCM Internal Circuit Malfunction

Possible Causes:



Short power circuit to output device control circuit (purge solenoid valve, EGR valve, VTCS solenoid valve, EGR boost sensor solenoid valve and/or EVAP system leak detection pump).
 
PCM malfunction
 

Trouble Code: P1794



BAT--BAT or Circuit Fail

Possible Causes:



Battery malfunction
 
Open or short circuit in wiring from PCM terminal 4I to battery positive cable
 
Burned MAIN fuse
 

Trouble Code: P1797



PNS--Open or Short

Possible Causes:



Transmission range switch malfunction
 
TCM malfunction
 
Neutral/clutch switch malfunction
 
ECM malfunction
 
Open or short circuit in wiring from TCM terminal 1D to ECM terminal 1L (AT)
 
Open or short circuit in wiring from neutral/clutch switch terminal to ECM terminal 1L (MT)
 

 
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