AutoTroubleShooter ®
OPERATING
INSTRUCTIONS
Index
Safety Precautions .......................................... 2
Vehicle Service Information ............................ 4
Visual Inspection ............................................. 4
Electrical Specifications ............................... 35
Warranty ..................................................... 106
1. Multimeter Basic Functions
Functions and Display Definitions ............. 5
Setting the Range ..................................... 7
Battery and Fuse Replacement ................. 8
Measuring DC Voltage .............................. 9
Measuring AC Voltage .............................. 9
Measuring Resistance ..............................10
Measuring DC Current ..............................10
Testing for Continuity .............................. 11
Testing Diodes ........................................ 12
Measuring Engine RPM ........................... 12
Measuring Dwell ..................................... 13
2. Automotive Testing with the CP7677
General Testing ...................................... 14
- Testing Fuses ...................................... 14
- Testing Switches .................................. 14
- Testing Solenoids and Relays ............. 15
Starting / Charging System Testing ....... 16
- No Load Battery Test ........................... 16
- Engine Off Battery Current Draw ......... 16
600
600
10A MAX
MAX 10sec
EACH 15min
FUSED
- Cranking Voltage/Battery Load Test ... 17
- Voltage Drops ...................................... 18
- Charging System Voltage Test ........... 19
Ignition System Testing .......................... 20
- Ignition Coil Testing ............................. 20
- Ignition System Wires .......................... 22
- Hall Effect Sensors/Switches .............. 23
- Magnetic Pick-Up Coils ....................... 24
- Reluctance Sensors ............................ 24
- Ignition Coil Switching Action .............. 25
Fuel System Testing ............................... 26
- Testing GM C-3 Mixture Control
Solenoid Dwell .................................... 26
- Measuring Fuel Injector Resistance ... 27
Testing Engine Sensors .......................... 28
- Oxygen (O
- Temperature Type Sensors ................ 30
- Position Type Sensors –
Throttle and EGR Valve Position,
Vane Air Flow ...................................... 31
- Manifold Absolute Pressure (MAP) and
Barometric Pressure (BARO) Sensors 32
- Mass Air Flow (MAF) Sensors ............ 33
Instrucciones en español .... 36
Instructions en français ....... 71
1
CP7677
®
CAT III 600V
) Type Sensors ................. 28
2