Code P1530, A/C Head Pressure Switch: Notes

A/C head pressure switch opens at 200-220 psi. When head pressure switch interrupts ground at PCM, left fan should run at high speed.

Code P1530 will set when the following conditions are present.

• Fan request circuit is grounded during first 6 seconds of engine run time.
• Engine coolant temperature is less than 88°F (31°C).
• Ambient air temperature is less than 82°F (28°C).
• RPM is less than 1800.
• Codes P0101, P0112, P0113, P0117 or P0118 are not set.
• All above conditions must be met at the same time.

If Code P1530 is set, cooling fan(s) will run at high speed anytime A/C is requested. Code P1530 does not illuminate the Malfunction Indicator Light (MIL).