Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Knock Sensor: Specifications

IGNITION TIMING 12° BTDC @ 900 rpm

VOLTAGE AND RESISTANCE

Air Regulator
Resistance 48 - 52 ohms

Canister Purge Vacuum Switching Valve
Resistance approx. 36 ohms

Coolant Temperature Sensor
-10°C (14°F) 7 - 12K ohms
10°C (50°F) 3 - 5K ohms
20°C (68°F) 2 - 3K ohms
50°C (122°F) 0.7 - 1K ohms
80°C (176°F) 0.2 - 0.4K ohms

Dropping Resistor
Between center terminal and any other terminal 5 - 7 ohms

Fuel Injectors
Resistance across terminals 2 - 3 ohms

Fuel Pump Relay
Between terminals WR and B approx. 80 ohms

Ignition Coil
Primary resistance 0.81 - 0.99 ohms
Secondary resistance 7.52 - 11.28K ohms

Knock Sensor
Resistance more than 1M ohms

Oxygen Sensor
Output voltage range approx. 0.3 - 0.8V

Pressure Regulator Vacuum Switching Valve
Resistance approx. 36 ohms

Vehicle Speed Sensor
Signal to ECM 4 pulses per revolution