For each code there is a diagnostic testing procedure . Without doing the testing we would only be guessing as to the problem . Sounds like you know next to nothing about automobile engine management systems . Your best bet ,take it to a qualified repair shop .
P0443 - EVAP Control System Canister Purge Valve Circuit Malfunction
The PCM monitors the state of the EVAP canister purge valve circuit output driver. The test fails when the signal moves outside the minimum or maximum limit for the commanded state.
- VPWR circuit open
- EVAP canister purge valve circuit shorted to GND
- Damaged EVAP canister purge valve
- EVAP canister purge valve circuit open
- EVAP canister purge valve circuit shorted to VPWR
- Damaged PCM
To verify normal function, monitor the EVAP canister purge valve signal PID EVAPPDC (or EVMV for electronic valve) and the signal voltage (PCM control side). With the valve closed, EVAPPDC will indicate 0 percent duty cycle (0 mA for EVMV) and the voltage approximately equal to battery voltage. When the valve is commanded fully open, EVAPPDC will indicate 100 percent duty cycle (1000mA for EVMV) and a voltage drop of 3 volts minimum is normal. Output test mode may be used to switch output ON/OFF to verify function.
P0135 - HO2S Sensor Circuit Malfunction (HO2S-11)
During testing the HO2S Heaters are checked for opens/shorts and excessive current draw. The test fails when current draw exceeds a calibrated limit and/or an open or short is detected.
- Short to VPWR in harness or HO2S.
- Water in harness connector.
- Open VPWR circuit.
- Open GND circuit.
- Low battery voltage.
- Corrosion or poor mating terminals and wiring
- Damaged HO2S heater.
- Damaged PCM.
- Wiring.
- Damaged HO2S heater.
- Damaged PCM.
P0155 - HO2S Sensor Circuit Malfunction (HO2S-21)
See DTC P0135
P0755 *
SSB, wiring, PCM
SSB solenoid circuit failure
SSB circuit fails to provide voltage drop across solenoid. Circuit open or shorted or PCM driver failure during on-board diagnostic.
Incorrect gear selection depending on condition mode and manual lever position. See Solenoid On/Off Chart.
Go To Pinpoint Test A .
P1747 *
EPC, wiring, PCM
EPC solenoid circuit failure, shorted circuit or output driver
Voltage through EPC solenoid is checked. An error will be noted if tolerance is exceeded.
Short circuit causes minimum EPC pressure (minimum capacity) and limits engine torque (alternate firm).
Go To Pinpoint Test D .
P1401 - DPF EGR Sensor Circuit High Voltage Detected
The EGR monitor checks the DPF EGR sensor signal to the PCM for high voltage. The test fails when the average voltage to the PCM goes to a voltage greater than the maximum calibrated value.
- DPF EGR circuit open
- VREF short to PWR
- Damaged DPF EGR sensor
- DPFEGR circuit short to PWR
- SIG RTN circuit open
- Damaged PCM
A DPF EGR PID reading greater than 4.5 volts with the key ON and engine OFF or running, indicates a hard fault.
P1451 - EVAP Control System Canister Vent Solenoid Circuit Malfunction
Monitors the canister vent (CV) solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified canister vent duty cycle by PCM command.
- VPWR circuit open
- CV solenoid circuit shorted to PWR GND or CHASSIS GND
- Damaged CV solenoid
- CV solenoid circuit open
- CV solenoid circuit shorted to VPWR
- Damaged PCM
To verify normal function, monitor the EVAP canister vent solenoid signal PID EVAPCV and the signal voltage (PCM control side). With the valve open, EVAPCV will indicate 0 percent duty cycle and the voltage approximately equal to battery voltage. When the valve is commanded fully closed, EVAPCV will indicate 100% duty cycle and a voltage drop of 4 volts minimum is normal. Output test mode may be used to switch output ON/OFF to verify function.
Look's like you have multiple problems an to say what the problem could be would be guessing . Your best bet ,take it to a qualified repair shop .
