Cutlass L4-138 2.3L VIN A FI HP (1990)
less than one volt.
The ECM uses the P/N signal as one of the inputs to control:
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Idle Air Control
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Code 24 VSS Diagnostics
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Code 62 Transaxil Gear Switches Diagnostics.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
1.
Checks for a closed switch to ground in park position. Different makes of "Scan" tools will read P/N differently. Refer to operators manual for
type of display used for a specific tool.
2.
Checks for an open switch in drive range.
3.
Be sure "Scan" indicates drive, even while wiggling shifter to test for an intermittent or misadjusted switch in drive range.
DIAGNOSTIC AIDS:
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If CKT 434 always indicates drive (open), a drop in the idle may exist when the gear selector is moved into drive range.
