MSD 62152 DIS-4 Plus Distributorless 4-Channel Ignition Control Manual

1. Product Overview

The MSD DIS-4 Plus Ignition Control is engineered for engines utilizing coil pack or waste spark ignition systems. This unit is capable of firing up to four individual coil packs, providing full power capacitive discharge sparks across the entire RPM range. Below 3,000 RPM, the system delivers multiple sparks for up to 20 degrees of crankshaft rotation, enhancing idle stability, starting performance, and throttle response.

Key features of the MSD 62152 DIS-4 Plus include:

• Adjustable features via rotary switches.
• Operating voltage range of 10-18 Volts, negative ground.
• Integrated Step Retard function.
• Supports up to 14,000 RPM with 14.4 Volts.
• Current draw of 6.6 Amps at 10,000 RPM.
• Two-Step Rev Control for launch and over-rev protection.
• LED Monitor for system status.
• EO # D-115-25 compliant.

Figure 1: The MSD 62152 DIS-4 Plus Ignition Control unit, including the main module, various wiring harnesses, and installation hardware. This image displays the complete package for installation.

2. Setup and Installation

2.1 Mounting the Unit

Select a mounting location that is away from direct engine heat, exhaust components, and excessive vibration. Ensure the location provides adequate ventilation for cooling. The unit should be mounted securely using the provided hardware. Avoid mounting near high-voltage components or radio frequency interference sources.

Figure 2: Bottom view of the MSD 62152 DIS-4 Plus unit, illustrating the mounting tabs with pre-drilled holes for secure installation. The heat sink fins are also visible.

2.2 Wiring Connections

All wiring connections must be secure and properly insulated to prevent shorts and ensure reliable operation. Refer to the detailed wiring diagram included with your product for specific connections to the vehicle's electrical system, ignition coils, and sensors. Ensure proper grounding of the unit.

• Power and Ground: Connect the main power wires directly to the battery, ensuring appropriate fuse protection. The ground wire must be connected to a clean, chassis ground point.
• Coil Connections: Connect the output channels of the DIS-4 Plus to the respective ignition coils according to the vehicle's firing order and coil pack configuration.
• Trigger Input: Connect the trigger input from the engine's crank or cam sensor as specified in the wiring diagram.
• Accessory Wires: Connect any accessory wires for features like two-step rev control or step retard as needed.

Figure 3: A detailed view of the main multi-pin connector on the MSD 62152 DIS-4 Plus unit. This connector facilitates the primary electrical connections to the vehicle's ignition system and power supply.

3. Operating the DIS-4 Plus

The MSD DIS-4 Plus features several adjustable settings to optimize ignition performance for specific engine requirements. These adjustments are made using rotary switches located on the unit.

3.1 RPM Limit Adjustment

The unit includes a two-step rev control feature, allowing for both a launch RPM limit and an over-rev limit. These limits are set using the designated rotary switches. The 'RPM MAX' switch sets the maximum engine RPM, while the 'RPM 2 STEP' switch sets the lower RPM limit for launch control. Consult the product's full manual for specific values and increment settings.

3.2 Step Retard Function

The Step Retard feature allows for a programmed ignition timing retard under specific conditions, often used for nitrous oxide injection or turbocharger spool-up. The amount of retard is adjustable via a dedicated rotary switch, typically in degrees. Activate this feature by applying a 12-volt signal to the designated input wire.

Figure 4: A close-up view of the rotary switches on the MSD 62152 DIS-4 Plus unit. These switches are used to set the RPM maximum, two-step RPM, and the degree of step retard, providing fine-tuned control over ignition parameters.

4. Maintenance

The MSD DIS-4 Plus Ignition Control is designed for durability and requires minimal maintenance. Regular inspection can help ensure continued optimal performance.

• Visual Inspection: Periodically check the unit and all wiring for any signs of damage, corrosion, or loose connections.
• Cleanliness: Keep the unit free from dirt, dust, and moisture. Use a soft, dry cloth for cleaning. Do not use harsh chemicals or solvents.
• Connection Integrity: Ensure all electrical connectors are firmly seated and free from debris.

5. Troubleshooting

If you experience issues with your MSD DIS-4 Plus, perform the following basic troubleshooting steps before seeking professional assistance:

• No Spark/Engine Cranks but Won't Start:
  • Verify all power and ground connections are secure and receiving proper voltage.
  • Check the main fuse for the ignition system.
  • Ensure the trigger input signal is present and correct.
  • Inspect coil pack connections and integrity.
• Engine Misfire/Rough Idle:
  • Check for loose or corroded coil pack connections.
  • Verify spark plug and spark plug wire condition.
  • Ensure proper settings on the rotary switches (RPM limits, step retard).
• LED Indicator: Observe the LED monitor for any diagnostic codes or unusual behavior. Refer to the full manual for LED status interpretations.

If issues persist after performing these checks, it is recommended to consult a qualified automotive technician or contact MSD technical support.

6. Specifications

7. Warranty and Support

For specific warranty information, please refer to the documentation provided with your MSD 62152 DIS-4 Plus Ignition Control at the time of purchase. Warranty terms typically cover manufacturing defects for a specified period.

For technical assistance, installation questions, or warranty claims, please contact MSD Ignition customer support directly. Contact information can usually be found on the manufacturer's official website or in the product packaging.