LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2000 >> B2500 SX, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls Trouble Shooting (3 Of 5) >> Clutch Pedal Position (CPP) Switch Malfunction

Clutch Pedal Position (CPP) Switch Malfunction

DTC P0704, P1709 DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0704, P1709 CLUTCH PEDAL POSITION (CPP) SWITCH MALFUNCTION
DETECTION CONDITION 
  • P0704 indicates a malfunction of the CPP switch has been detected.
  • P1709 indicates the voltage is high or the switch is open when the voltage should be low or the switch should be closed grounding the circuit.
POSSIBLE CAUSE 
  • Starter relay disconnected during Quick Test.
  • PNP/CPP circuit shorted to power.
  • PNP/CCP open in SIG RTN circuit.
  • Damaged PNP or CPP switch.
  • Damaged PCM.
HINT  CPP Switch Description 
  • Input to the PCM indicating the clutch pedal position (engaged or disengaged).
  • The PCM provides a 5-volt reference (VREF) signal to the CPP switch.
    • If the switch is closed indicating the clutch pedal is engaged, the output voltage from the PCM is grounded through the signal return line to the PCM, and there is 1 volt or less indicating there is a reduced load on the engine.
    • If the CPP switch is open, meaning the clutch pedal is disengaged, the input on the CPP signal to the PCM will be approximately 5 volts indicating a load on the engine.
G03988146Courtesy of MAZDA MOTORS CORP.
DTC P0704, P1709 INSPECTION

STEP INSPECTION ACTION
1
  • Was PCM Quick Test performed? 
 Yes Go to next step.
No Perform PCM Quick Test.
2 CHECK CPP/PNP SWITCH FUNCTION
NOTE: During KOEO Self Test, clutch pedal must be down for M/T or the gear shift lever must be in NEUTRAL for A/T.
  • Key ON, Engine OFF (KOEO).
  • Access CPP/PNP PID and observe PID cycling ON/OFF with clutch pedal up, then down (M/T) or gear shift lever in gear, then NEUTRAL (A/T).
  • Does the reading change from ON to OFF? 
 Yes Fault intermittent.
Disconnect PCM.
Inspect both ends of the connector for damaged or pushed out pins, corrosion, loose wires.
Repair as necessary.
If OK, replace PCM. See COMPUTERIZED ENGINE CONTROLS .
Go to step 6.
No Go to next step.
3 CHECK CPP SWITCH
  • Key OFF.
  • Locate the CPP switch near the clutch pedal.
  • Inspect switch and bracket for damage, bent or broken conditions. Repair as required.
  • Disconnect CPP harness connector and inspect for damage, pushed out or broken pins and broken wires. Repair as necessary.
  • Measure resistance across the CPP switch terminals with the clutch pedal down.
  • Is the resistance less than 5.0 ohms? 
 Yes Go to next step.
No Replace the CPP switch. See ELECTRICAL COMPONENT LOCATOR .
Go to step 6.
4 CHECK RESISTANCE OF CPP CIRCUIT
  • Disconnect NGS Tester.
  • Disconnect PCM.
  • Install Breakout Box, leave PCM disconnected.
  • Measure resistance of CPP circuit between PCM test pin 64 and the CPP switch harness connector.
  • Measure resistance of CPP circuit between PCM test pin 64 and the CPP switch harness connector.
  • Is each resistance less than 5.0 ohms? 
 Yes Go to next step.
No Repair open circuit.
Go to step 6.
5 CHECK CPP CIRCUIT FOR SHORT
  • Measure resistance between PCM test pin 64 (CPP) and PCM test pin 91 (SIG RTN).
  • Measure resistance between PCM test pins 64 (CPP) and chassis ground.
  • Is each resistances greater than 10K ohms? 
 Yes Replace PCM. See COMPUTERIZED ENGINE CONTROLS .
Go to step 6.
No Repair short circuit.
Go to step 6.
6 VERIFY TROUBLESHOOTING OF DTCs COMPLETED
  • Make sure to reconnect all disconnected connectors.
  • Clear DTCs from PCM memory using NGS tester generic OBD-II function.
  • Perform PCM Quick Test.
  • Is same DTC present? 
 Yes Replace PCM. See COMPUTERIZED ENGINE CONTROLS .
Repeat PCM Quick Test.
No If any other DTC is present, go to applicable DTC inspection.
If no DTC is present, troubleshooting complete.
scientia non olet · About LEMON Manuals