Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
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lemon-manuals.org.ua
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PCM Controlled Tachometer Diagnosis
Diagnostic Chart (Part 1 Of 2):
Diagnostic Chart (Part 2 Of 2):
CIRCUIT DESCRIPTION The tachometer signal is a Pulse Width Modulated
(PWM) signal. The Instrument Panel Cluster
(IPC) supplies ignition voltage to the tachometer control circuit through a pull-up resistor. The a low side driver in the
PCM grounds the tachometer control circuit in relation to engine speed.
