What is P1504?
When you see this code, there has been a detection by the Powertrain Control Module (PCM) of an electrical load failure of the Idle Air Control (IAC) circuit. This means that there may be an open or a short in the harness, the connection may be damaged, or the IAC is dirty or faulty.
When to use code p1494 on a pressure pump?
Thus, if the PCM detects that the state of the reed switch ( aka control switch) has not changed when a self-diagnostic cycle starts due to a failure of the diaphragm, the control solenoid and/or its control circuit, or the control switch, it will set code P1494 and illuminate a warning light.
When does code p1494 set in Powertrain Control Module?
Note however that the above definitions all have the same basic meaning, which is that code P1494 sets when the PCM (Powertrain Control Module) has detected a malfunction in the LDP ( [EVAP] Leak Detection Pump) itself, as opposed to when a leak in the EVAP system is detected.
What causes a p1494 leak in a PCM?
Typical causes of P1494 could include the following-. Defective Leak Detection Pump. Damaged, burnt, shorted, disconnected, or corroded wiring in the LDP Switch Control Circuit, or in one or more control circuits of sensors that supply input information to the LDP/PCM.
How to diagnose EVAP leak detection pump p1494?
NOTE #3: Apart from a repair manual for the application being worked on, a graduated vacuum gauge is required item to diagnose P1494 accurately. Record all fault codes present, as well as all available freeze frame data. This information can be of use should an intermittent fault be diagnosed later on.
How much does it cost to diagnose a p1508 code?
The cost of diagnosing the P1508 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
How to check for p1508 idle air control valve malfunction?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins. The cost of diagnosing the P1508 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city.
Note however that the above definitions all have the same basic meaning, which is that code P1494 sets when the PCM (Powertrain Control Module) has detected a malfunction in the LDP ( [EVAP] Leak Detection Pump) itself, as opposed to when a leak in the EVAP system is detected.
What are the symptoms of stored trouble code p1494?
Apart from a stored trouble code and an illuminated warning light, the only other noteworthy symptoms of code P1494 may be the presence of a strong fuel odor as vapors are released from leak sites, and that the vehicle may not pass an emissions test. Note that this code very rarely produces driveability issues.