Mazda B-Series 1998-06

3.0L V6 VIN U Std 3

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Trouble Code: P1138



HO2S-12 Lack of Switching, Indicates Rich (Self-Test)

Possible Causes:



Check air cleaner element, air cleaner housing for blockage
 
Fuel pressure regulator is leaking, or fuel pressure is too high
 
HO2S wiring may be crossed at the connector
 
Fuel injectors leaking or contaminated (they may be sticking)
 
EVAP vapor recovery system has failed (canister full of fuel)
 

Trouble Code: P1150



HO2S-21 (Bank 2 Sensor 1) Fuel Control Limit Reached

Possible Causes:



HO2S is damaged or has failed
 
HO2S circuits wet or oily, corroded, or poor terminal contact
 
HO2S signal circuit open, shorted to ground, short to power
 
Low fuel pressure or vehicle driven until it was out of fuel
 
Excessive fuel pressure, leaking or contaminated fuel injectors
 
Leaking fuel pressure regulator
 
EVAP vapor recovery system has failed
 
Air leaks located after the MAF sensor
 
Exhaust leaks before or near the front HO2S
 
EGR valve stuck, EGR diaphragm leaking, or gasket leaking
 
Oil dipstick not seated or engine oil level too high (overfilled)
 

Trouble Code: P1151



HO2S-21 (Bank 1 Sensor 1) Indicates A/F Ratio Too Lean

Possible Causes:



Air leaks located after the MAF sensor
 
Base Engine: Check for vacuum leaks with a Smoke Tester
 
Intake air system is leaking, obstructed and damaged
 
Low fuel pressure or vehicle driven until it was out of fuel
 
PCV system has air leaks at the valve or related hoses
 

Trouble Code: P1152



HO2S-21 (Bank 2 Sensor 1) Indicates A/F Ratio Too Rich

Possible Causes:



Check air cleaner element, air cleaner housing for blockage
 
Fuel pressure regulator is leaking, or fuel pressure is too high
 
Fuel injectors leaking or contaminated (they may be sticking)
 
EVAP vapor recovery system has failed (canister full of fuel)
 

Trouble Code: P1260



Anti-Theft System Signal Detected, Engine Disabled

Possible Causes:



Previous theft condition has occurred
 
Anti-Theft System is damaged or has failed
 

Trouble Code: P1270



Engine RPM or Vehicle Speed Limit Reached

Possible Causes:



Excessive wheel slippage (due to water, ice, mud or snow)
 
Engine over-revved with the gear selector in Neutral position
 
Vehicle was driven at a very high rate of speed
 

Trouble Code: P1309



Misfire Detection Monitor

Possible Causes:



CMP sensor is not properly synchronized in the engine
 
CMP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1400



EGR Valve Position Sensor Circuit Low Input (Self-Test)

Possible Causes:



EGRP sensor signal circuit is shorted to ground
 
EGRP sensor power circuit is open
 
EGRP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1401



EGR Valve Position Sensor Circuit High Input (Self-Test)

Possible Causes:



EGRP sensor signal circuit is open
 
EGRP sensor ground circuit is open
 
EGRP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1405



DPFE Sensor Upstream Hose Off or Plugged

Possible Causes:



DPF EGR sensor upstream hose is disconnected
 
DPF EGR sensor upstream hose is plugged (ice)
 
EGR orifice tube is plugged or damaged
 

Trouble Code: P1406



DPFE Sensor Downstream Hose Off or Plugged

Possible Causes:



DPF EGR sensor downstream hose is disconnected
 
DPF EGR sensor downstream hose is plugged (ice)
 
EGR orifice tube is plugged or damaged
 

Trouble Code: P1408



EGR System Flow Out Of Range (Self-Test)

Possible Causes:



EGR valve stuck closed or iced up, or the flow path is restricted
 
EGR valve diaphragm leaking, hose is off, plugged or leaking
 
EGR system vacuum lines are loose or damaged
 
EGRA solenoid is damaged or has failed
 
EGRV solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1409



EGR Vacuum Regulator Solenoid Circuit Malfunction

Possible Causes:



EGR VR solenoid control circuit is open
 
EGR VR solenoid control circuit is shorted to ground
 
EGR VR solenoid control circuit is shorted to system power
 
EGR VR solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1443



EVAP System Purge Flow Malfunction

Possible Causes:



Fuel vapor hose blocked between EVAP purge valve and PF sensor, or blocked between purge valve and intake manifold, or vacuum hose blocked between purge valve and intake manifold
 
EVAP canister purge solenoid stuck closed (mechanically)
 

Trouble Code: P1450



EVAP Control System Excessive Vacuum Detected

Possible Causes:



Air filter element is extremely dirty or clogged
 
Canister drain cut valve (CDCV) is damaged or has failed
 
Charcoal canister is full of fuel or moisture, or is damaged
 
EVAP system drain passage is clogged
 
Fuel tank pressure sensor is damaged or out-of-calibration
 
Purge solenoid valve is damaged or has failed
 

Trouble Code: P1451



Canister Vent Solenoid Circuit Malfunction

Possible Causes:



CV solenoid control circuit is open or shorted to ground
 
CV solenoid control circuit is shorted to system power (B+)
 
CV solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1460



Wide Open Throttle A/C Cut-Off Relay Circuit Malfunction

Possible Causes:



A/C relay is damaged or has failed
 
A/C relay power circuit is open between relay and ENGINE fuse
 
A/C relay control circuit is open between the relay and the PCM
 
A/C relay control circuit is shorted to ground
 
A/C relay control circuit is shorted to system power (B+)
 
PCM has failed
 

Trouble Code: P1464



A/C Control Signal Circuit Malfunction (Self-Test)

Possible Causes:



A/C relay control circuit is shorted to system power (B+)
 
A/C relay is damaged or has failed
 
A/C WOT relay is damaged or has failed
 
A/C clutch is damaged or has failed
 
PCM has failed
 

Trouble Code: P1500



Vehicle Speed Sensor Intermittent Signal

Possible Causes:



VSS signal circuit is open (an intermittent fault)
 
VSS signal circuit is shorted to ground (an intermittent fault)
 
VSS signal circuit is shorted to VREF (an intermittent fault)
 
VSS is damaged or has failed
 
PCM has failed
 

Trouble Code: P1501



Vehicle Speed Sensor Circuit Malfunction (Self-Test)

Possible Causes:



Charging system problem (check alternator for AC leakage)
 
Ignition system component has failed (i.e., check for signs of primary or secondary voltage leaking from the coil, coil wire, spark plug wires or boots, or the spark plug insulators
 
PCM has failed
 

Trouble Code: P1504



Idle Air Control Solenoid Circuit Malfunction

Possible Causes:



IAC solenoid control circuit shorted to ground
 
IAC solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1506



Idle Air Control System RPM Higher Than Expected

Possible Causes:



EGR valve is stuck open or leaking, or the gasket is leaking
 
EVAP purge valve is leaking or stuck in open position
 
IAC solenoid control circuit is shorted to ground (intermittent)
 
IAC valve is stuck open (it may be dirty or have failed)
 
PCV valve is leaking, or a leak in the intake manifold exists
 
PCM has failed
 

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: 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: 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
 

Trouble Code: P0107



BARO Sensor Circuit Low Input

Possible Causes:



EGR Boost sensor signal circuit is shorted to ground
 
EGR boost sensor VREF circuit is open or shorted to ground
 
EGR Boost sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0108



BARO Sensor Circuit High Input

Possible Causes:



EGR boost sensor signal circuit open from sensor to the PCM
 
EGR boost sensor ground circuit open from sensor to the PCM
 
EGR Boost sensor signal circuit is shorted to VREF or power
 
EGR Boost sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0109



Manifold Absolute Pressure (MAP) Sensor

Possible Causes:



MAP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0137



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

Possible Causes:



HO2S signal circuit is open or shorted to ground
 
Air leaks at the exhaust manifold or exhaust pipes
 
HO2S contaminated with wrong fuel, has deteriorated or failed
 
PCM has failed
 

Trouble Code: P0138



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

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: P0172



Adaptive Fuel Trim Too Rich (Bank 1)

Possible Causes:



Base engine -mechanical- fault affecting one or more cylinders
 
EVAP system component has failed or canister fuel saturated
 
Exhaust leaks before or near where the front HO2S is mounted
 
Fuel control sensor out of calibration (i.e., IAT, MAP or MAF)
 
Fuel injectors (one or more) sticking or leaking fuel
 
Fuel delivery system supplying too much fuel during cruise or idle periods (e.g., faulty fuel pump, or faulty pressure regulator)
 
HO2S is contaminated, deteriorated or it has failed
 

Trouble Code: P0300



Random Misfire Detected

Possible Causes:



Base engine mechanical fault affecting one or more cylinders
 
CMP sensor is damaged or failed (problem may be intermittent)
 
Fuel metering fault that affects more than one cylinder
 
Fuel pressure too low or too high, fuel supply contaminated
 
EVAP system problem or the EVAP canister is fuel saturated
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Ignition system fault that affects more than one cylinder
 
MAF sensor is contaminated (this can cause a lean condition)
 

Trouble Code: P0316



Misfire Detected

Possible Causes:



Base engine mechanical fault
 
CKP sensor is damaged or failed (problem may be intermittent)
 
Fuel metering fault
 
Ignition system fault
 

Trouble Code: P0325



Knock Sensor Circuit Malfunction

Possible Causes:



Knock sensor signal circuit is open
 
Knock sensor signal circuit is shorted to ground
 
Knock sensor is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0326



Knock Sensor Circuit Range/Performance

Possible Causes:



Knock sensor signal circuit is open (intermittent fault)
 
Knock sensor signal circuit shorted to ground (intermittent fault)
 
Knock sensor is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0350



Ignition Coil Primary Circuit Malfunction

Possible Causes:



Ignition coil primary circuit is open or shorted to ground
 
Ignition coil primary circuit is shorted to system power (B+)
 
Ignition coil power circuit is open between coil and Start circuit
 
PCM has failed
 

Trouble Code: P0400



EGR System Flow Malfunction

Possible Causes:



EGR vent solenoid circuit open or shorted to ground
 
EGR vent solenoid power circuit is open
 
EGR vent solenoid is damaged or has failed
 
DPFE sensor signal circuit is open or shorted to ground
 
DPFE sensor is damaged or has failed
 
EGR valve assembly is leaking, sticking, damaged or has failed
 
EGR valve vacuum hose(s) lose, damaged or disconnected
 
Exhaust pipe to EGR valve is restricted or plugged
 
PCM has failed
 

Trouble Code: P0401



EGR System Insufficient Flow Detected

Possible Causes:



EGR boost solenoid control circuit is open or shorted to ground
 
EGR boost solenoid power circuit is open to the Main Relay
 
EGR boost solenoid is damaged or has failed
 
EGR boost sensor is damaged or has failed
 
EGR valve position sensor is damaged, stuck or has failed
 
EGR valve assembly is leaking, damaged or has failed
 
EGR valve vacuum hose(s) lose, damaged or disconnected
 
IAT, MAF, TP and VSS (sensor) has drifted out-of-range
 
PCM has failed
 

Trouble Code: P0403



EGR Valve (stepper motor) malfunction

Possible Causes:



EGR valve malfunction
 
Connector or terminal malfunction
 
Short to power circuit in wiring to EGR valve terminals and PCM terminals
 
Open circuit in wiring between EGR valve terminals and PCM terminals
 
PCM has failed
 

 
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